Tuesday, July 23, 2024

Hackers Can Steal NTLM Credentials Through PDF Files

Hackers taking advantage of the recently disclosed Microsoft Office Exploitation that allows to include information that one document has in another document. Instead of exploiting this vulnerability attackers using this feature as an advantage to embedding remote documents inside of a PDF file and to steal NTLM Credentials.

According to Checkpoint research team, “NTLM hash leaks can also be achieved via PDF files with no user interaction or exploitation”. By using this feature attackers can inject malicious contents into the PDF and if the PDF file is opened then the target automatically start leaking data in the form of NTLM hashes.

The PDF files contain primarily of objects together with Document structure, File structure, and content streams. The dictionary contains the objects that are called as entries, the first element is the key and the second element is the value.

Also Read Creating and Analyzing a Malicious PDF File with PDF-Parser Tool

By injecting a malicious entry an attacker can entice arbitrary targets to open the crafted PDF file which then automatically leaks their NTLM hash, challenge, user, hostname and domain details” Check Point researchers published PoC explaining the vulnerability.

If the user opens the document then there is no alert on attacker’s activity and it is impossible to notice the behavior. The leaked data are transferred through SMB and the attackers can use it for various SMB relay attacks.

“Our investigation leads us to conclude that all Windows PDF-viewers are vulnerable to this security flaw and will reveal the NTLM credentials,” said checkpoint research team. The issue was disclosed to Adobe and Foxit.


Latest articles

SonicOS IPSec VPN Vulnerability Let Attackers Cause Dos Condition

SonicWall has disclosed a critical heap-based buffer overflow vulnerability in its SonicOS IPSec VPN....

Hackers Registered 500k+ Domains Using Algorithms For Extensive Cyber Attack

Hackers often register new domains for phishing attacks, spreading malware, and other deceitful activities. Such...

Hackers Claim Breach of Daikin: 40 GB of Confidential Data Exposed

Daikin, the world's largest air conditioner manufacturer, has become the latest target of the...

Emojis Are To Express Emotions, But CyberCriminals For Attacks

There are 3,664 emojis that can be used to express emotions, ideas, or objects...

Beware Of Fake Browser Updates That Installs Malicious BOINC Infrastructre

SocGholish malware, also known as FakeUpdates, has exhibited new behavior since July 4th, 2024,...

Data Breach Increases by Over 1,000% Annually

The Identity Theft Resource Center® (ITRC), a nationally recognized nonprofit organization established to support...

UK Police Arrested 17-year-old Boy Responsible for MGM Resorts Hack

UK police have arrested a 17-year-old boy from Walsall in connection with a notorious...
Guru baran
Guru baranhttps://gbhackers.com
Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.

Free Webinar

Low Rate DDoS Attack

9 of 10 sites on the AppTrana network have faced a DDoS attack in the last 30 days.
Some DDoS attacks could readily be blocked by rate-limiting, IP reputation checks and other basic mitigation methods.
More than 50% of the DDoS attacks are employing botnets to send slow DDoS attacks where millions of IPs are being employed to send one or two requests per minute..
Key takeaways include:

  • The mechanics of a low-DDoS attack
  • Fundamentals of behavioural AI and rate-limiting
  • Surgical mitigation actions to minimize false positives
  • Role of managed services in DDoS monitoring

Related Articles