C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 5f63dd87aabe2011…

MALICIOUS

PDF

53.4 KB Created: 2011-06-22 16:59:00 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 14ed3d20b715218f17c3f4bee50115bc SHA-1: 4dcc0bda3e912ebd7365c86379f476180cacc2ec SHA-256: 5f63dd87aabe201123dbfd54928f3fd4a3dcd4ae093fe1744b5dd7d76b126874
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The PDF file contains a critical heuristic firing for the CVE-2008-2551 exploit, which is known to be used by the C6 Messenger Downloader. This exploit is designed to download and execute a second-stage payload. While many embedded URLs were found, they were all confirmed benign, suggesting the primary malicious functionality relies on the exploit.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3153

Heuristics 2

  • 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.
  • 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=1110859������
    • http://www.irna.ir/View/FullStory/?NewsId=1110669��������������������
    • http://www.farsnews.com/newstext.php?nn=8902211665���������������
    • http://www.presstv.ir/Persian.aspx?id=9853������������������
    • http://www.farsnews.com/newstext.php?nn=8902211752���������������������
    • http://www.farsnews.com/newstext.php?nn=8902211644������������������������������
    • http://www.farsnews.com/newstext.php?nn=8902191035���������������������������
    • http://www.farsnews.com/newstext.php?nn=8902211716���������
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1079795������������������������
    • http://www.irna.ir/View/FullStory/?NewsId=1110759
    • http://www.presstv.ir/Persian.aspx?id=9855������
    • 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_off00001739.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1739 73272 bytes

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