C6 Messenger Downloader PDF malware analysis — malicious · 6444cae35b601052

MALICIOUS

PDF

314.9 KB Created: 2011-05-26 13:08:35 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))

MD5: f7bf876ee39089f4b09570da29710647 SHA-1: b2d32c0f9315a22f3f450388020569e5d0ce1f43 SHA-256: 6444cae35b601052ac238f86ea00b6741eeab7aac6ef5e8094f602af439339c8

92 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for CVE-2008-2551, indicating an exploit for a DownloaderActiveX. This exploit likely targets the embedded URL http://c6.community.alice.it/download/DownloaderActiveX.cab#Version=1,0,0,1 to download a payload. A second URL, http://artisanballoonz.com/system/system.exe, is also present and is likely the second-stage payload. The ML classifier strongly supports the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9529

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_002_off00000810.bin` `80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x810	73272 bytes

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