Malicious PDF — malware analysis report

Static analysis result for SHA-256 65541e0e02e76d21…

MALICIOUS

PDF

37.8 KB Authoring application: Pdftk
MD5: 8efc01e8a88cf9533108e2ebaa513da1 SHA-1: 33afcbfe3a44318790acae060263991eb581227d SHA-256: 65541e0e02e76d2195a1b2dbfd6f0f264054e604dad91245b96db909e29c97ed
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics, including a critical PDF_SEO_LINK_FARM alert and ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0. The document body, despite being truncated and obfuscated, contains numerous URLs pointing to other PDF files, suggesting a link farm designed to distribute further malicious content. The primary attack pattern involves a lure of a job application letter template to encourage the download of these linked malicious PDFs.

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://conneracup.com/uploads/1/3/0/3/130313177/5255310.pdf
    • http://liveartstampabay.org/uploads/1/3/0/6/130604838/7f5eca9aa85c9.pdf
    • http://kellyrobertson.net/uploads/1/3/0/4/130488067/fumaw.pdf
    • http://morrisoncohentherapy.com/uploads/1/3/0/6/130639608/sutudolu.pdf
    • http://twbmotors.com/uploads/1/3/0/6/130620326/xinerap.pdf
    • http://liamsamolis.com/uploads/1/3/0/4/130436483/zigobonaxuzew-vagazo-kadigavepenu.pdf
    • http://directordean.org/uploads/1/3/0/4/130476086/100286c2.pdf
    • http://moosewoodalaska.com/uploads/1/3/0/5/130588532/kasurutitit_funigiziwuwi_tetunuga_fuwevadet.pdf
    • http://newcastlenetworkinggroup.com/uploads/1/3/0/2/130272283/gupaxatowuzud_vojanejaroj_dazaledupi_rasob.pdf
    • http://nechampionship.com/uploads/1/3/0/6/130604948/nunakekopapudafivi.pdf
    • http://myentouragemusic.com/uploads/1/3/0/6/130621043/130621043.html#job+application+letter+template+doc

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000129d.bin
6f1a8501a02b6a168ca97bf3f716ef89b139361d3910d200696849eeb8e34557		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D 7988 bytes

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