C6 Messenger DownloaderActiveX — PDF malware analysis

Static analysis result for SHA-256 6ca942d2bdb015fa…

MALICIOUS

PDF

551.4 KB Created: 2011-05-26 13:24:16 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 208276bd58f3868a8fde048a571e5c6f SHA-1: 896946eef811ab3ad54eca1c2236ef0f82dcb254 SHA-256: 6ca942d2bdb015facbe3b05ff711c9db51b4f8a071a4b605f61373b8a11a0b24
100 Risk Score

Malware Insights

C6 Messenger DownloaderActiveX · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2008-2551 indicates the PDF is designed to exploit this vulnerability. The embedded URL http://artisanballoonz.com/system/system.exe is likely the download location for the second-stage payload. The ML classifier also strongly suggests maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9634

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.
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • 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_off00000b4a.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB4A 73272 bytes

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