C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 0717b470d723c68b…

MALICIOUS

PDF

52.2 KB Created: 2011-06-22 17:55:53 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 83f0d54ece7c1cc7d76047bba7b4722a SHA-1: 114d0e70f7f7b4a1ff6fb49af4417a6afac8ce11 SHA-256: 0717b470d723c68bffa1974c0e4a111ce843f1532a94889be3ee72f45f8421cf
64 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file that contains a known exploit for CVE-2008-2551, targeting the C6 Messenger Downloader ActiveX control. This exploit is designed to download and execute a second-stage payload from a remote URL. The presence of the exploit and a suspicious executable URL strongly indicates a malicious downloader.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3786

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://www.irna.ir/View/FullStory/?NewsId=889420
    • http://www.irna.ir/View/FullStory/?NewsId=889345
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1014879
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1015017
    • http://www.irna.ir/View/FullStory/?NewsId=889420���������������
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1014879���������������
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1015017������
    • 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_off000012d5.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D5 73272 bytes

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