Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dea9a0e45cddbb…

MALICIOUS

PDF

46.9 KB Authoring application: Pdftk
MD5: b851a438b6707542dcfd9e74fbaaf38d SHA-1: 992345c594f89dca6eb5a48038c380544a3cc3bf SHA-256: b4dea9a0e45cddbb6e2cdfbf320fd7fc318e470cf8a541c94e7e55d9fd0ec35f
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique commonly used for SEO manipulation or to distribute malicious payloads. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The primary attack pattern involves redirecting users to a network of suspicious PDF files hosted across various domains.

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://pruritusresearch.net/uploads/1/3/0/4/130435721/wovovup.pdf
    • http://cellsys.co.za/uploads/1/3/0/6/130621709/zofusetitiremikesebo.pdf
    • http://naturecalling.us/uploads/1/3/0/6/130620800/1719432.pdf
    • http://nitrotvtrial.com/uploads/1/3/0/6/130620364/7958c42321e45dd.pdf
    • http://samrichardson.org/uploads/1/3/0/7/130739389/bebujijikijaberu.pdf
    • http://bedifutuj.raphaacupuncture.com/uploads/2020/01/29/37740c3bf4fe51e.pdf
    • http://muziekkapel.be/uploads/1/3/0/2/130288338/pitoke.pdf
    • http://stgeorgecountrydancing.com/uploads/1/3/0/6/130605278/gixifaw-puxisuw.pdf
    • https://jevobodokanu.weebly.com/uploads/1/3/0/5/130551058/zuromixex.pdf
    • http://crosbyirontonmusic.org/uploads/1/3/0/6/130639498/42c0c46.pdf
    • http://grooveshoprecords.com/uploads/1/3/0/7/130739835/a490e51b9a6b47.pdf
    • http://newperspectivemedical.com/uploads/1/3/0/6/130639580/130639580.html#tra%C3%A7o+falciforme+e+gravidez

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000014ff.bin
eaa381b3c898bf7d052d42114be13863ca59a44aef58cf09a46fb9aabe561d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF 10832 bytes
font_01_sfnt_off0000718d.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718D 16036 bytes

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