C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 61f8cf0fbdc9564a…

MALICIOUS

PDF

54.5 KB Created: 2011-06-22 17:08:08 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: b752b0c3b7434ada424f91ef421947a0 SHA-1: ac8120a2abe1f7b56018f8d035ac741fcb807da8 SHA-256: 61f8cf0fbdc9564aa19251efc212e2cd5be76577deff34050e89c3bb4ead7562
94 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains a known exploit (CVE_2008_2551) targeting PDF readers, indicating an attempt to execute arbitrary code. The embedded URLs, though mostly benign, suggest a potential lure or part of the exploit chain. The ML classifier also flagged the document as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5492

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://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://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.irna.ir/View/FullStory/?NewsId=872875
    • 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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