C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 7f94e5f742ea1b76…

MALICIOUS

PDF

52.2 KB Created: 2011-04-13 09:47:41 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 02d8c37a6efdd82bc10d58fe73b0fcf1 SHA-1: 81240744b9c067dc8ba1f9d481198ab3776bf2ef SHA-256: 7f94e5f742ea1b76825c7d2b0f1670ee0894672b8c3c8def5ea17ddc7b22262e
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

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

The file is a PDF that contains a critical heuristic firing for CVE-2008-2551, indicating it exploits a vulnerability to download a payload. The embedded URL 'http://c6.community.alice.it/download/DownloaderActiveX.cab#Version=1,0,0,1' and the unknown reputation URL 'http://artisanballoonz.com/system/system.exe' are highly suspicious. The exploit likely leads to the execution of the downloaded file, consistent with the C6 Messenger Downloader family.

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=889420
    • http://www.irna.ir/View/FullStory/?NewsId=889345
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1014879
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1015017
    • 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_off000012ad.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12AD 73272 bytes

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