Malicious PDF — malware analysis report

Static analysis result for SHA-256 033ef431a38c3828…

MALICIOUS

PDF

40.9 KB Created: 2020-10-08 06:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 9091694c4c8b4759706f25daa5c61ff3 SHA-1: 694499cd7598aed0d21e30e44b1bb22b1a1b7934 SHA-256: 033ef431a38c3828b4eb7013bddaac6994a4c7fa40c1f79eaf93d78725bb5336
224 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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/strik?keyword=o+mio+babbino+caro+piano+solo+pdf In PDF document text
    • https://site-1036691.mozfiles.com/files/1036691/zigeduvojudini.pdfIn PDF document text
    • https://site-1036796.mozfiles.com/files/1036796/tavabajuv.pdfIn PDF document text
    • https://site-1039693.mozfiles.com/files/1039693/ninefoz.pdfIn PDF document text
    • https://site-1043574.mozfiles.com/files/1043574/79079932287.pdfIn PDF document text
    • https://site-1040263.mozfiles.com/files/1040263/kezexi.pdfIn PDF document text
    • http://botixab.aperfectdayevent.com/uploads/1/3/1/3/131382439/lujogir.pdfIn PDF document text
    • http://files.bushardt.com/uploads/1/3/1/8/131856119/4286237.pdfIn PDF document text
    • http://files.markchrislermusic.com/uploads/1/3/2/7/132712093/b1c638ca.pdfIn PDF document text
    • http://files.flawlessreflectionsautodetailing.com/uploads/1/3/1/4/131409037/430701.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7837/5829/files/big_ideas_math_geometry_student_journal_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9469/4304/files/the_art_of_mackin_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4844/9701/files/daganokiruzezuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/733f39ac-5baf-46bb-a909-3c40b93e8b36/50324534904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e65a333-7792-4695-b32b-40505b02070b/jajunovotugadipovike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6387a0-2d65-4228-86d1-716f59ab9ec1/werafekegujavifidag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea873648-f5a8-46b5-b00c-a6238b7fe58b/pefobazokupokovewan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93850ef5-f7df-4636-a293-08eb89ff8d63/vijafowekum.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52AB 5468 bytes
SHA-256: 31214b86c00a2777511b61d38cb5969097025802ed056eb55e334556b4342b67
font_01_sfnt_off0000651a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651A 15144 bytes
SHA-256: 571d87ca3a02a0a6018bdb344b3bdc9d00643b2fe19578c10c77dc2c321a7d4e

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