C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 7df5f70eb2897b7e…

MALICIOUS

PDF

201.8 KB Created: 2011-07-07 22:35:55 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 3289c8107d8226e92884b91bf0f2408f SHA-1: 4f864242d7892efad6fbdba1a763fd79925bbbe6 SHA-256: 7df5f70eb2897b7e89865706a2c52a1617248615288c1f13eb627e9e32d0ddba
94 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file that exploits the CVE-2008-2551 vulnerability, indicated by the 'C6 Messenger DownloaderActiveX exploit' heuristic. This exploit is designed to download and execute a second-stage payload from a remote location. The presence of an embedded URL pointing to a CAB file and a subsequent executable further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7617

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://prayer.aviny.com/city_time.aspx?Code=151&Y=1388&M=6&D=1
    • http://prayer.aviny.com/city_time.aspx?Code=151&Y=1388&M=6&D=1������
    • 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_off00000795.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x795 73272 bytes

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