C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 bc1fa0842377fe4f…

MALICIOUS

PDF

54.5 KB Created: 2011-06-22 16:46:33 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: a68f235850c77326759e3129278512b3 SHA-1: 407725a080ba066c8065d39b3469e6a032e974c1 SHA-256: bc1fa0842377fe4f91ac32dd6e4793359114e41403953a0537e5e8dbae9b5a22
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK
T1204.002 Malicious File

The sample is a PDF document that exploits the CVE-2008-2551 vulnerability, identified by the 'C6 Messenger DownloaderActiveX exploit' heuristic. This exploit is designed to download and execute a second-stage payload from a remote URL. The presence of the 'system.exe' URL strongly suggests this is the payload being fetched. The family is identified as C6 Messenger Downloader based on the exploit heuristic.

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://quqnoos.com/index.php?option=com_content&task=view&id=2364&Itemid=52&lang=farsi
    • http://artisanballoonz.com/system/system.exe
    • http://www.irna.ir/View/FullStory/?NewsId=872572
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1009565
    • http://www.irna.ir/View/FullStory/?NewsId=872726
    • http://www.irna.ir/View/FullStory/?NewsId=865488
    • http://www.presstv.com/Persian.aspx?id=6836
    • http://www.presstv.com/detail.aspx?id=115049&sectionid=351020202
    • 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_off00001bcd.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BCD 73272 bytes

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