C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 9b30a9a83d725d8c…

MALICIOUS

PDF

49.7 KB Created: 2011-04-22 21:42:59 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 7dcf92181b853b17f519a649d46ec35b SHA-1: 52a878ca2c16155db69688fd545011e7d251ec21 SHA-256: 9b30a9a83d725d8c5c59e1543f81ec2c1483957a57f29f66da6a89a58871797f
60 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

The critical heuristic firing for CVE_2008_2551 indicates an exploit for C6 Messenger DownloaderActiveX. This is further supported by the embedded URL pointing to a potential executable payload. The document body is heavily obfuscated, but the presence of the exploit and the download URL strongly suggest the intent is to download and execute a second-stage payload.

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.

FilenameKindSourceSize
stream_001_off000008bb.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8BB 73272 bytes

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