Malicious PDF — malware analysis report

Static analysis result for SHA-256 1485b3ff67631863…

MALICIOUS

PDF

36.1 KB Created: 2020-11-09 00:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 956634c5a5629a48a2ba347a524e067e SHA-1: dbb7d5d78286c37bab38fd834723d48ae50e4ff4 SHA-256: 1485b3ff67631863d31bf56d2b0c0541d4455839d62c2dab16361f598fd067bd
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL related to game searches. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a link farm designed to drive traffic to potentially harmful sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/123?keyword=world+s+hardest+game+4+unblocked+games In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5f9a369e32e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_5f90a93c8ab7d.pdfIn PDF document text
    • https://fufajogaxofamu.weebly.com/uploads/1/3/4/6/134627879/9558750.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/xizivovowewiwelix.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/rubidokezive/alternative_dispute_resolution_adr.pdfIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://milosibad.files.wordpress.com/2020/11/jubeniwodag.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://zanamofaxo.files.wordpress.com/2020/11/37544428964.pdfIn PDF document text
    • https://bimoladotaj.files.wordpress.com/2020/11/jumesegidawu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/kiketipugojege.pdfIn PDF document text
    • https://rakidate.files.wordpress.com/2020/11/71629890515.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/30539665578.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/wutuwarexal.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/mixed_verb_tenses_exercises_with_answers_1_bachillerato.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_off00004d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D79 5660 bytes
SHA-256: 629d0e2b5cd6d41897dd459c2adaa9c46ba5384ca403021675c647a6d03046dc
font_01_sfnt_off0000609b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609B 10188 bytes
SHA-256: 3273d60eb30f5e83f9892709f84f0ebb50cb687d7b5e6c99401d601ad75affe3

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