Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba85f2ea0c96444…

MALICIOUS

PDF

34.9 KB Authoring application: Nitro PDF
MD5: 0702ffca48b050423c0b76648b603396 SHA-1: 5e9cbbdf67836c61d231b169e4f37846caea60c5 SHA-256: 4ba85f2ea0c96444eaba3dca6a131cd075f48942df6b1c0898f42d2471959e24
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links to external PDF files, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this file as malicious, specifically as phishing or traffic redirection malware. The document body, though heavily obfuscated, appears to be a lure related to resignation letters, suggesting a social engineering pretext. The primary attack pattern involves redirecting users to a link farm, likely to serve malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ringtonesystem.club/uploads/1/3/0/7/130738754/katabujuzulaga.pdf
    • http://dreamasweetdream.com/uploads/1/3/0/8/130813557/1921502.pdf
    • http://significadodeemojis.com/uploads/1/3/0/5/130538880/6fcc6.pdf
    • http://masteringyourorgasm.com/uploads/1/3/0/7/130738779/6249717.pdf
    • http://bakersman.ca/uploads/1/3/0/6/130622042/94f0c30c.pdf
    • http://dochotrod.com/uploads/1/3/0/5/130588499/kazij_xejisow_wuxag.pdf
    • http://atxbeers.com/uploads/1/3/0/2/130289443/2674631.pdf
    • http://montessori-lomas.com/uploads/1/3/0/7/130739766/tamokiga-gunez-lofetabu.pdf
    • http://distantjove.com/uploads/1/3/0/5/130543028/8758120.pdf
    • http://oatbardicschool.org/uploads/1/3/0/2/130288333/bddaa.pdf
    • http://ajhomecooking.com/uploads/1/3/0/7/130775269/5530f0.pdf
    • http://apinavigator.com/uploads/1/3/0/5/130551441/gojal-tetifebatufesup-pomulem-sefepevon.pdf
    • http://jamesjaspers.com/uploads/1/3/0/8/130814967/7be25c52e1a5b7d.pdf
    • http://puppettearspod.com/uploads/1/3/0/5/130590157/lukoketezi_purulelaxavaki.pdf
    • http://myroyalorganics.com/uploads/1/3/0/4/130494059/188531.pdf
    • http://trentriverdesigns.com/uploads/1/3/0/7/130739239/130739239.html#resignation+letter+format+for+college+teacher

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fac.bin
f1a6bc0480a11f27c94093f46ca0759de0013400fa9739b8ea820bc3a5728a62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAC 7176 bytes

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