C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 0f8d2cdaec535e34…

MALICIOUS

PDF

54.5 KB Created: 2011-04-13 09:44:09 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 4bd7aab34651bb304fefd76c3db56711 SHA-1: 266650f01862cb27a22ce76cd8c3c2d070b4663c SHA-256: 0f8d2cdaec535e34e5f9a6bd5980e7b4a8202f02cf7c75bb9b6badd1df501d19
94 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file that contains a known exploit for CVE-2008-2551, identified as the C6 Messenger Downloader. This exploit is designed to download and execute a second-stage payload. The presence of the exploit and the ML classifier's flagging indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5492

Heuristics 3

  • C6 Messenger DownloaderActiveX exploit critical CVE exact CVE_2008_2551
    PDF stream bytes contain HTML/ActiveX content configuring the vulnerable C6 Messenger DownloaderActiveX control with propDownloadUrl and propPostDownloadAction=run. This is the published exploit shape for CVE-2008-2551.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://artisanballoonz.com/system/system.exe
    • http://www.irna.ir/View/FullStory/?NewsId=1024978
    • http://www.farsnews.com/newstext.php?nn=8901060276
    • http://www.irna.ir/View/FullStory/?NewsId=1024982
    • http://www.irna.ir/View/FullStory/?NewsId=1024985
    • http://www.farsnews.com/newstext.php?nn=8901060017
    • http://www.irna.ir/View/FullStory/?NewsId=1024984
    • http://www.farsnews.com/newstext.php?nn=8901060014
    • http://www.irna.ir/View/FullStory/?NewsId=1024974
    • http://www.farsnews.com/newstext.php?nn=8901060112
    • http://www.irna.ir/View/FullStory/?NewsId=1024978������
    • http://www.irna.ir/View/FullStory/?NewsId=1024982���������������
    • http://www.irna.ir/View/FullStory/?NewsId=1024985������������������
    • http://www.farsnews.com/newstext.php?nn=8901060017���������������
    • http://c6.community.alice.it/download/DownloaderActiveX.cab#Version=1,0,0,1

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00001b84.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B84 73272 bytes

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