C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 87c0d92a7c49c825…

MALICIOUS

PDF

48.7 KB Created: 2011-06-22 17:05:05 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 030b481cf2e44f3128787dbc57fb504d SHA-1: d6847dbc3c4d07280537ded15b2be67dd55a3c27 SHA-256: 87c0d92a7c49c82509e85507b72fcc5090f772c23a8ed2afd958ace9ead35db9
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The PDF file contains a heuristic match for the CVE-2008-2551 exploit, which is known to download and execute a second-stage payload. The embedded URL 'http://artisanballoonz.com/system/system.exe' likely hosts this payload. The other embedded URL, 'http://c6.community.alice.it/download/DownloaderActiveX.cab#Version=1,0,0,1', is associated with the C6 Messenger Downloader.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2843

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_001_off000004c5.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C5 73272 bytes

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