Malicious PDF — malware analysis report

Static analysis result for SHA-256 13836b8ee1d61f5c…

MALICIOUS

PDF

35.7 KB Created: 2020-10-05 16:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1573b95c9144c6cfb4be62d784cf4d7a SHA-1: cb904ca94f3e34945164410dc1073dcc43883cd6 SHA-256: 13836b8ee1d61f5cd5667d025d4ea4dad0f26f60870cb2f01f92ed381592a09f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for educational material. The presence of multiple Shopify links suggests an attempt to blend malicious links with seemingly benign ones, a common tactic in SEO poisoning or link farm schemes.

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://ggtraff.ru/strik?keyword=ejercicios+de+sufijos+diminutivos+y+aumentativos+4+primaria+pdf
    • http://mexew.hotmilkbreastfeeding.com/uploads/1/3/1/4/131408899/8592098.pdf
    • http://files.musicforyoungviolinists.com/uploads/1/3/1/4/131437799/gawoxatebevasimi.pdf
    • http://files.greyhoundadoption.ca/uploads/1/3/2/6/132682335/93ea882a.pdf
    • http://files.nspirehomesolutions.com/uploads/1/3/1/4/131406412/jasov.pdf
    • http://files.aquacleanwi.com/uploads/1/3/2/3/132302944/162695.pdf
    • http://xawosejev.itsplatinumnotgreyltd.com/uploads/1/3/0/9/130969336/xibazumunodolor-taniwenikeledo.pdf
    • http://files.matt1leracing.com/uploads/1/3/1/6/131606605/8620cf81cc4262.pdf
    • http://files.mbpphotobooths.com/uploads/1/3/0/8/130815381/8309751.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0486/6247/9016/files/ice_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0481/7718/4919/files/wemofo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0670/4290/files/conair_handheld_steamer_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0486/0156/3304/files/fijokenozosikawibuzav.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/a.h._studenmund_using_econometrics_a_practical_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/solicitud_de_empleo_en_blanco_para_llenar.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/2290403485.pdf
    • https://cdn.shopify.com/s/files/1/0481/7829/9031/files/pearson_anatomy_and_physiology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0480/7462/1082/files/30978006464.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/chemical_reactions_types_of_reactions_and_balancing_practice_worksheet_answers.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_off00004986.bin
ff312060e936e376e18d5bd4f6fe4a944e213739931c0103d424b2272ab8f48f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4986 5552 bytes
font_01_sfnt_off00005c71.bin
f30e14315e47b1f30be51b70fd0f61589a808994244e38dddb6ca58e3f82df7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C71 10744 bytes

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