C6 Messenger DownloaderActiveX — PDF malware analysis

Static analysis result for SHA-256 75a68c851d06b21a…

MALICIOUS

PDF

54.2 KB Created: 2011-05-17 09:13:23 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 264cb6fe6e9190b56934fded381f7b05 SHA-1: ee31e6f8add04ba185265614c113af4357172229 SHA-256: 75a68c851d06b21a55a1e72b57fb2548d66ac944b3b794f95e48e121f248409e
64 Risk Score

Malware Insights

C6 Messenger DownloaderActiveX · confidence 85%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file that contains a critical heuristic firing for CVE-2008-2551, indicating an exploit for the C6 Messenger DownloaderActiveX. This exploit is designed to download and execute a second-stage payload. The presence of an embedded URL pointing to a .cab file, which is often used to deliver ActiveX controls, further supports this. An additional URL points to a system.exe file, likely the dropped payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4355

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://www.afghanpaper.com/nbody.php?id=6922
    • http://artisanballoonz.com/system/system.exe
    • http://www.irna.ir/View/FullStory/?NewsId=1033919
    • http://www.irna.ir/View/FullStory/?NewsId=1035794
    • http://www.irna.ir/View/FullStory/?NewsId=1035878
    • http://www.presstv.ir/Persian.aspx?id=8945
    • http://www.presstv.ir/Persian.aspx?id=8944
    • http://www.irna.ir/View/FullStory/?NewsId=1033919������
    • http://www.irna.ir/View/FullStory/?NewsId=1035794������
    • http://www.presstv.ir/Persian.aspx?id=8945������������������������
    • 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_004_off00001a14.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A14 73272 bytes

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