Malicious PDF — malware analysis report

Static analysis result for SHA-256 6844bf2468522c2f…

MALICIOUS

PDF

29.9 KB Authoring application: Adobe PDF Library 9.0
MD5: bd34d8407c8e8729463f25663e68f51a SHA-1: d9c9b18246c289c31bb904e7146407508abe6e42 SHA-256: 6844bf2468522c2f003ba886f7cb45edc9d91b96ec7a397297542a873a16008a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. ClamAV detected this as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', and a machine learning model also flagged it as malicious with high confidence. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://happymedicalzone.com/uploads/1/3/0/6/130620511/zozurebi_fomozew_duwidotew_zuribuvenujo.pdf
    • http://sosdetail.com/uploads/1/3/0/7/130739256/14f4de06c9d.pdf
    • http://sanjyu-oiwai.com/uploads/1/3/0/4/130476221/xebomiduvo_jukidut_kuwowo_vilamelane.pdf
    • http://tmw.industries/uploads/1/3/0/5/130543764/3d43f11.pdf
    • http://cliniquedelasciatiquerep.com/uploads/1/3/0/7/130738974/lezivu-nufagi-dunasimir-wutakefof.pdf
    • http://coaptonline.com/uploads/1/3/0/5/130588550/wasavikojejukak.pdf
    • http://myqualityvalue.com/uploads/1/3/0/4/130435947/pepaxep.pdf
    • http://doomsy.com/uploads/1/3/0/4/130477009/dezixefevekanana.pdf
    • http://www.myfish.tw/uploads/1/3/0/7/130775972/d41c532ed8ae.pdf
    • http://holerunner150.com/uploads/1/3/0/6/130620947/d4a170a.pdf
    • http://hostmaster.counsellingec1.com/uploads/1/3/0/4/130483499/xonidusiniwinapaje.pdf
    • http://mta-sts.shoptvinternet.com/uploads/1/3/0/7/130739353/130739353.html#how+to+measure+alkalinity+in+drinking+water

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002086.bin
cf07b01808d3b9dd724d4d5f84c577580a972ff8a383439cf02e6836683e2514		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2086 6780 bytes

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