C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 67d1c26e1b013505…

MALICIOUS

PDF

54.0 KB Created: 2011-04-22 21:28:12 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 5be1925557e7c1f5be635fe548637768 SHA-1: 363b21131699159a4d312ade8f6b876e113d4d89 SHA-256: 67d1c26e1b0135053f491d2525f5e8677bd97c9af444bcc8b580799a6919276b
94 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by an ML classifier and contains a marker for the CVE-2008-2551 exploit. This exploit is known to download and execute payloads from external sources. The presence of the 'DownloaderActiveX.cab' URL and a suspicious executable URL further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5492

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=831410
    • http://www.irna.ir/View/FullStory/?NewsId=831244
    • http://www.irna.ir/View/FullStory/?NewsId=832138
    • http://www.irna.ir/View/FullStory/?NewsId=833016
    • http://www.farsnews.com/newstext.php?nn=8809171838
    • http://www.irna.ir/View/FullStory/?NewsId=830786
    • http://www.presstv.ir/Persian.aspx?id=6413
    • http://www.irna.ir/View/FullStory/?NewsId=831410������
    • http://www.irna.ir/View/FullStory/?NewsId=832138������������������������
    • http://www.farsnews.com/newstext.php?nn=8809171838���������������
    • http://www.irna.ir/View/FullStory/?NewsId=830786�����������������
    • 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_off000019a1.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19A1 73272 bytes

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