C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 5e3e023f2eb84039…

MALICIOUS

PDF

314.9 KB Created: 2011-05-17 08:56:27 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 4762e75edc8b2059d3ee3c85120bd0c6 SHA-1: 1566ba395c5fd347a89490e3d56f6c2552311aec SHA-256: 5e3e023f2eb840395c64c7a5418d24b4b85d44ba76824c7339a3fa1be9e1b3e4
92 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 CVE-2008-2551, indicating an exploit for the C6 Messenger Downloader. This exploit likely targets a vulnerability to download and execute a payload from the URL http://artisanballoonz.com/system/system.exe. The presence of the DownloaderActiveX.cab URL further supports the downloader family attribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9529

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_off00000810.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x810 73272 bytes

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