Malicious PDF — malware analysis report

Static analysis result for SHA-256 d488f78016ddc2bd…

MALICIOUS

PDF

43.2 KB Created: 2020-11-08 09:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4bccd609805ef8aac2fdec19ab03ad39 SHA-1: 35fe64926663a55f14e5bd2df88b79433abb4e55 SHA-256: d488f78016ddc2bd6c8fef51456ada71fa383afcaa638f9f5c9026189ec10a56
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'traffmen.ru'. The document body, though heavily obfuscated, contains the same URL and other PDF links, suggesting a link farm or redirection tactic. The ML classifier also strongly indicated maliciousness.

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://traffmen.ru/123?keyword=yu+gi+oh+the+sacred+cards+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5f9196c5c5d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_5f99b9cb5a933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_5f9aa1654eb7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_5fa1851ac901a.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/velowo_dakemolaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5f977f6f97fe2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sasufufa/fisozeresupadodubin.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/redinuwunulikimuzoduj.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/74459980664.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/words_for_painted.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/lizibinetabugopo.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/uc_berkeley_spring_break_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/zukepikizelutukolonif.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/bugugaxugeruvudexunu.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/libodiwobesobosirik.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6977 5128 bytes
SHA-256: 43911389c06bb7717b6526142c4dccf9c354cbabdeaf914eaf1a2682f622618e
font_01_sfnt_off00007ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE6 10912 bytes
SHA-256: 979f20403c548cc3a53645338ae1fb2566b8e03e79d3cc5f2d2a4eeccf2d5eb5

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