Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fed46bcd0906d3…

MALICIOUS

PDF

56.7 KB Created: 2020-11-20 00:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af5349a5c5d292e3859c9f4d60f324f4 SHA-1: f6c7d8c1cbfebcdc93baf2165a555979080e91d5 SHA-256: c1fed46bcd0906d39d33d0efe25ed3ee429668f04cce567c45c23ac6f935eae7
94 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts numerous external links to other PDFs. One such link points to 'https://s3.amazonaws.com/wivunonovef/jobapaxome.pdf', and another embedded URI is 'https://traffine.ru/strik?utm_term=simple+blink+led+circuit'. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the structure suggests a malicious document designed to redirect users to potentially harmful content or for SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8144

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://traffine.ru/strik?utm_term=simple+blink+led+circuit
    • https://cdn-cms.f-static.net/uploads/4427821/normal_5fb5b1f87dd18.pdf
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5f98488247dc7.pdf
    • https://retelajipubo.weebly.com/uploads/1/3/4/7/134700068/tovajesitiwifiw.pdf
    • https://cdn-cms.f-static.net/uploads/4368998/normal_5fa42a922c8bc.pdf
    • https://cdn-cms.f-static.net/uploads/4414680/normal_5f99190bbba79.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wivunonovef/jobapaxome.pdf
    • https://uploads.strikinglycdn.com/files/22ea1a31-d042-4e04-9112-2833803148b8/43069251904.pdf
    • https://uploads.strikinglycdn.com/files/ac6f5e54-b45d-4e0e-9ccd-960c99e965d9/toshiba_satellite_l55-_c5272_review.pdf
    • https://uploads.strikinglycdn.com/files/77a7fc71-ca4e-47c2-aa5d-fe2813b0a638/2900407372.pdf
    • https://s3.amazonaws.com/kigavanus/toefl_ibt_listening_practice_test_free_download.pdf
    • https://s3.amazonaws.com/sabegokek/shell_shockers_aimbot_github.pdf
    • https://s3.amazonaws.com/jopomodilamego/alsource3i_openal32_dll.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e6.bin
a3d9fb4866227fc38ab233a8cc8ce812b746425640fcd5cae62edefd497bf369		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E6 5140 bytes

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