C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 403430bcde367b7f…

MALICIOUS

PDF

54.5 KB Created: 2011-05-26 14:27:02 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: fee364c5fc6ebe4cdfde2a3ccac58cbb SHA-1: 2e190d44d1636cfbcfe6d067dfdc073dbb380bf8 SHA-256: 403430bcde367b7f5832ac6670a436f24573c6d446462f9c6435e81f56fcfaca
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

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

The sample is a PDF file that contains a critical heuristic firing for the CVE-2008-2551 exploit, which is known to download and execute secondary payloads. The embedded URL 'http://c6.community.alice.it/download/DownloaderActiveX.cab#Version=1,0,0,1' points to a CAB file, likely containing the exploit and payload. An additional unknown reputation URL 'http://artisanballoonz.com/system/system.exe' was also extracted, which could be a secondary download target.

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=1024978
    • http://www.farsnews.com/newstext.php?nn=8901060276
    • http://www.irna.ir/View/FullStory/?NewsId=1024982
    • http://www.irna.ir/View/FullStory/?NewsId=1024985
    • http://www.farsnews.com/newstext.php?nn=8901060017
    • http://www.irna.ir/View/FullStory/?NewsId=1024984
    • http://www.farsnews.com/newstext.php?nn=8901060014
    • http://www.irna.ir/View/FullStory/?NewsId=1024974
    • http://www.farsnews.com/newstext.php?nn=8901060112
    • 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_off00001b84.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B84 73272 bytes

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