C6 Messenger Downloader PDF malware analysis — malicious · 71fd42607be0018d

MALICIOUS

PDF

216.0 KB Created: 2011-05-26 15:25:57 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: ac790804832810b4f47171bb9b7e041d SHA-1: c6443b1e1c31f5700b6ad51ac3e5a15457afa5f7 SHA-256: 71fd42607be0018d66ad0cd3dbc3cbde2d813021799fdbd284703ec90626a053

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by an ML classifier and contains a heuristic firing for the CVE-2008-2551 exploit. This exploit is known to download and execute a payload. The embedded URL http://artisanballoonz.com/system/system.exe is highly suspicious and likely the second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.8217

Heuristics 2

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.
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.

Filename	Kind	Source	Size
`stream_001_off000003f7.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3F7	73272 bytes

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