Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de36b9ee71fd65e…

MALICIOUS

PDF

32.3 KB Created: 2020-08-01 05:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 937d7b7922c54b02b29ad8b9f503e021 SHA-1: d3ab8773d5d718f5fd28514adfa721aa07837e8c SHA-256: 5de36b9ee71fd65e658ae530c9ecf003af8b62a92f19793d3f25bed6647b9cf6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, identified as a PDF link farm, designed to redirect users to various external resources. One of these links, 'https://ttraff.ru/pify?keyword=frindle+online+pdf', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a campaign to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.ru/pify?keyword=frindle+online+pdf
    • http://files.indoorcyclinginstitute.com/uploads/1/3/0/9/130969993/31a12d0.pdf
    • http://files.t3northloop.com/uploads/1/3/1/3/131381772/8d4b4e1f0c8.pdf
    • http://files.lexiostrow.com/uploads/1/3/0/9/130969673/e619ca9ff342cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/mutagobezedag.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/47860634584.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/vuminonufe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0441/files/15174314485.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9697/files/monuvufakimelivigipenirip.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3282/files/venawovawo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/44291694872.pdf
    • https://cdn.shopify.com/s/files/1/0429/7503/5541/files/best_escape_from_tarkov_settings.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/46790823988.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/43155693492.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000432f.bin
22beec0dad07e4115ab3423586ff608bf57eafdb78f5cf1f750e126e1bfd7b68
pdf-font-stream PDF embedded font (sfnt) at offset 0x432F 4600 bytes
font_01_sfnt_off000052e5.bin
ff7e69023d11fb07717aba5b83ce4c61cd6173986323ff10393c874e5e4091b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x52E5 9928 bytes