C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 08d8363643b1d017…

MALICIOUS

PDF

52.0 KB Created: 2011-04-27 03:33:57 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: f6b68eafe1c3528786ec9f0744aad6df SHA-1: ce14c8b826dd9b192b5d53b59b3808afd5a29f4e SHA-256: 08d8363643b1d01789a9b7e219654eb62a6bb726047b4cbc4e9bef6c67a89cbd
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 85%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample exploits CVE-2008-2551, a known vulnerability associated with the C6 Messenger Downloader ActiveX control. This exploit is designed to download and execute a secondary payload, identified by the URL http://artisanballoonz.com/system/system.exe. The presence of the DownloaderActiveX.cab URL suggests a connection to the C6 Messenger family.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3662

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://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_003_off00001179.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1179 73272 bytes

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