Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d4ccb7692ff097…

MALICIOUS

PDF

39.4 KB Authoring application: Adobe PDF Library 9.0
MD5: d98300e3f1d1aa0ca2bf9c3b8a61d5a8 SHA-1: a11cb53304b22e5c58a27c906bfacc550ee1aa5d SHA-256: 49d4ccb7692ff09791f10585bd99638757a900e96ab1fa583ce9224a2fc50998
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO spam or to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically identifies this behavior. ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 further supports the malicious classification. The ML classifier also strongly indicates maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack pattern is the mass linking.

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://northcountrysuggieshop.com/uploads/1/3/0/6/130639197/sewetotop.pdf
    • http://cnumwconference.weebly.com/uploads/1/3/0/6/130639767/08ea0.pdf
    • https://gofelitoboza.weebly.com/uploads/1/3/0/2/130270863/14b72af6c4c.pdf
    • http://mdcrichmond.com/uploads/1/3/0/6/130622013/7491314.pdf
    • http://kavutaredi.pnptogo.com/uploads/2020/01/28/9668304.pdf
    • http://ttyf.weebly.com/uploads/1/3/0/5/130544131/3691080.pdf
    • http://dis.profmediarus.ru/uploads/2020/01/27/wulasabu.pdf
    • http://whitection.ru/uploads/2020/01/27/gilevaxuge.pdf
    • http://kibanekol.remont-msk4.icu/uploads/2020/01/28/lanitizewoxuxural.pdf
    • http://drlyons.net/uploads/1/3/0/5/130551001/tedumerekemepulu.pdf
    • http://catamaranadastra.com/uploads/1/3/0/5/130588490/3992087.pdf
    • http://zusikonusu.rsschel.ru/uploads/2020/01/29/d0813.pdf
    • http://lewisvillepestpros.com/uploads/1/3/0/5/130589354/bbe9cef017a.pdf
    • http://stephmatarazzo.com/uploads/1/3/0/5/130588639/kipizadejozo_nizasaketanuz_talasafevisasuw_jokil.pdf
    • http://lavosalije.jasonbarun.com/uploads/2020/01/28/55e844d3745961d.pdf
    • http://alphritasims.com/uploads/1/3/0/6/130620788/33ff51f87c.pdf
    • http://synchroski.org/uploads/1/3/0/5/130588998/9043793.pdf
    • http://ankezimmermann.ca/uploads/1/3/0/3/130313200/130313200.html#clash+of+clans+wallpaper

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000145c.bin
512ff8f73c7ce8de2065718d5ffbcd9509813b72e027d22554d1eb6e0fcc07f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145C 7520 bytes
font_01_sfnt_off00005e5a.bin
bb66d78edca8aa75a8db461931e44ad6eab12e4cd439df836d92d13c6ef6c22d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5A 2668 bytes

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