Malicious PDF — malware analysis report

Static analysis result for SHA-256 9354bfc3cdb68a03…

MALICIOUS

PDF

37.9 KB Authoring application: Scribus
MD5: 994d950f0bb18a91d8c46025ba3a8258 SHA-1: 0131738d3ae0085266f76717d708ee32afd3962f SHA-256: 9354bfc3cdb68a03ed285fc16b76b8529b6a407b19f3d94c546c455854ddb1df
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF files hosted on various domains, indicative of a link farm or SEO poisoning attack. ClamAV identified this as Pdf.Phishing.TtraffRobotInstall-7605656-0, and a machine learning classifier also flagged it as malicious. The primary attack pattern involves directing users to a network of external PDF documents.

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://bloomfieldhighclassof69.com/uploads/1/3/0/6/130620637/4296293.pdf
    • http://rachelnamba.com/uploads/1/3/0/5/130589264/76451802ce4.pdf
    • http://josephanspach.com/uploads/1/3/0/6/130604046/nakalozazajanos_rexirifunex.pdf
    • http://ictforpeace.net/uploads/1/3/0/3/130313132/sosuvamuv.pdf
    • http://mustardgreen.net/uploads/1/3/0/5/130589031/sezafanivepupebo.pdf
    • http://stullinvest.com/uploads/1/3/0/2/130289205/00111ecd24.pdf
    • http://mogulmeadows.org/uploads/1/3/0/6/130620412/7148540.pdf
    • http://mindexpansionacademy.com/uploads/1/3/0/7/130776561/3284854.pdf
    • http://clubheros.org/uploads/1/3/0/5/130588417/xekosux.pdf
    • http://digital-chicago.net/uploads/1/3/0/5/130551475/losevulamezubozipope.pdf
    • http://a1805142xstreamtravel.xsideas.com/uploads/1/3/0/5/130588605/130588605.html#difference+between+epilepsy+and+convulsions

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032b1.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32B1 2616 bytes
font_01_sfnt_off00003e61.bin
ab5ab1b528bd84437790832ab9b222eb1e7f2232de057635b13c8ab89c5d2cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3E61 7784 bytes

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