Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c259880accc179f…

MALICIOUS

PDF

41.2 KB Created: 2020-08-06 15:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 617fbb5eddbdbaba0bb67d70b973fbf8 SHA-1: 774d2297b58b659803592430d33997900bc46e50 SHA-256: 5c259880accc179fca2719c3800d8cd56c90ca5bf24c4290f74166a836d5d743
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful 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.com/pify?keyword=descargar+resucito+cantos+del+camino+neocatecumenal+pdf
    • http://files.justinbernasconi.com/uploads/1/3/1/4/131483267/344953.pdf
    • http://files.jacquelineclewis.com/uploads/1/3/0/7/130776060/samaworusujiru.pdf
    • http://pitubu.stayoncourse.org/uploads/1/3/1/3/131378780/6595929.pdf
    • http://idyanunciad.com1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/comcast_tv_guide_seattle.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4495/files/beginner_core_workout.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/24685293152.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3082/files/tuburetesosuduxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7345/4748/files/32436266181.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/26854335084.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/book_of_spells.pdf
    • https://cdn.shopify.com/s/files/1/0428/9242/7430/files/novojesexuret.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5050/files/fallout_4_summon_npc.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/55616351694.pdf
    • https://cdn.shopify.com/s/files/1/0436/1689/5133/files/xevatebozarogisijedezeju.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_off00005edb.bin
b3f9908ad144e3c5c4477635a3555525ee1a0d2b44bc9feb900d3cd864e0a140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDB 5476 bytes
font_01_sfnt_off0000716c.bin
fa4230b70634f979b91e7b181a1372f222d9b6293e053b9f5b42cbf262178a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716C 11208 bytes

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