C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 657aa4fee06b0962…

MALICIOUS

PDF

490.8 KB Created: 2011-05-26 12:56:16 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: a05af6e54a2b82e9373004285c2c4ddb SHA-1: bce1850f66cb09f79f8fca0abd80ac6ec0fdebe2 SHA-256: 657aa4fee06b09625cf1accb789787e2c7e11b56a4dd9728afb091c3cfdd91f9
92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The PDF contains a marker for the CVE-2008-2551 exploit, which is known to download and execute payloads. The embedded URL points to a CAB file that likely contains an ActiveX control, and another URL points to a Windows executable. These indicators strongly suggest the file is designed to exploit a vulnerability and download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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_002_off00000a07.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA07 73272 bytes

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