Ransomware Research
Pdf Ransomware
Pdf is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2023, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- First Seen
- January 1, 2023
How Pdf Ransomware Works
Targeted Files
Full extension -> .id-C63F241F.[3442516480@qq.com].pdf
File Encryption Patterns
Pdf modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..pdfRansom Note and Payment Demands
After encrypting files, Pdf displays ransom notes demanding payment for file recovery:
RETURN FILES.txtRansom message:
notes/RETURN FILES.txt
Note locations:
RootDiscsDesktopInfo.htaRansom message:
notes/Info.hta
Note locations:
StartUpRoamingTechnical Indicators
Associated Executable Files
The following executable files are associated with Pdf ransomware:
StrmStrm.exe
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About This Analysis
This Pdf ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery solutions, helping organizations defend against and recover from ransomware attacks like Pdf.
Last updated: July 30, 2025