Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31f7d301e422508…

MALICIOUS

PDF

28.2 KB Authoring application: Nitro PDF
MD5: a4bc4fbbb357cae7169978d51beec895 SHA-1: c26a5a467d03f5d4a9315fc4cd1b86e4a5a35c51 SHA-256: a31f7d301e42250809f1807d95aecd121b01128c3531706356bda42e8615740b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. ClamAV identified this as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', suggesting a phishing or traffic redirection purpose. The embedded URLs are the primary indicators of compromise, likely leading to malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://naba.my-accountonline.net/uploads/2020/01/28/6d94a.pdf
    • http://mori.igrovye-avtomaty-na-dengi.top/uploads/2020/01/28/9a03409.pdf
    • http://kigomezoli.nauticflclub.org/uploads/2020/01/27/tofusupujav-xijuxedol-goxibutosul-zuvaloj.pdf
    • http://lorir.fsbservicios.com/uploads/2020/01/27/fewafegotas_dosazuf_xexisikejopa_pudisutenu.pdf
    • http://vedazalisi.id7me.net/uploads/2020/01/28/sudavitune.pdf
    • http://murciaon.com/uploads/2020/01/28/47c4127f.pdf
    • http://xif.reshenie-odincovo.ru/uploads/2020/01/27/27cdaf37554c.pdf
    • http://spectrumherniaclinic.com/uploads/1/3/0/6/130605044/130605044.html#evinrude+sportwin+9.+5

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010d9.bin
66ace08a79cb747f0c196a2a4738a30b73d6a9dc6f816be88c79ee69df679a88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9 6940 bytes

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