C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 37732e76833af0fa…

MALICIOUS

PDF

54.0 KB Created: 2011-04-22 21:27:50 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 28fd4cfa357fdc826f57d90ddaaad807 SHA-1: c80674084701a6d41b8520d5bd0111699237b3e6 SHA-256: 37732e76833af0faa5cc5be0601f9ab6b314d6565e0a9e71c299eeb76e0f8a56
64 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The critical heuristic firing for CVE_2008_2551 indicates the file exploits a known vulnerability in PDF readers. The embedded URL pointing to 'DownloaderActiveX.cab' and the heuristic for an external URI further suggest a download mechanism. The unknown reputation URL 'http://artisanballoonz.com/system/system.exe' is highly suspicious and likely the payload. The document body contains obfuscated text which does not provide further clarity on the lure, but the exploit and download pattern are clear.

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://artisanballoonz.com/system/system.exe
    • http://www.irna.ir/View/FullStory/?NewsId=1027286
    • http://www.presstv.ir/Persian.aspx?id=8820
    • 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_off0000198f.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x198F 73272 bytes

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