Malicious PDF — malware analysis report

Static analysis result for SHA-256 869df0de435cf843…

MALICIOUS

PDF

41.8 KB Created: 2020-10-01 19:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: e32ce0bc93126fd52df20cc8f5317af7 SHA-1: a55757f795344e0bc0e7b61172a4266700563808 SHA-256: 869df0de435cf8433ecfe916bcd30f49441fc6f9374d83e0afa978f8ca7386a4
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=basic+principles+of+cost+and+management+accounting+pdf In PDF document text
    • http://files.kidsagainstcrohns.org/uploads/1/3/0/8/130874627/rusize-miteguwel.pdfIn PDF document text
    • http://files.online-workouts.com/uploads/1/3/1/4/131408142/pebekapivoxipit.pdfIn PDF document text
    • https://site-1040092.mozfiles.com/files/1040092/begegebunolebilazupo.pdfIn PDF document text
    • https://site-1036855.mozfiles.com/files/1036855/18146604828.pdfIn PDF document text
    • https://site-1037026.mozfiles.com/files/1037026/94438920745.pdfIn PDF document text
    • https://site-1036675.mozfiles.com/files/1036675/tokujipexukokuxadod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c75d101-020f-46ee-b11d-0920bd125c3f/90022706950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8337d5-271f-4e2d-b04e-5e6122d74fe0/taruzaxaxujofiviluvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9127b04e-6f2e-4738-ac9b-cda91a25cac5/nebosojojakaxigikege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc28b8a8-8089-4114-beaa-2857a7e56bd8/8461970334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ce7e0a-b4d5-404f-b56c-9520b93bc691/saripugamirawasef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c1f3aa-870d-4308-ae43-7592794c93a2/migalekati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d97e98-3288-4e02-a487-565119042fc2/62114402146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26039d26-1f6c-4f46-a033-fe5f62ac6064/dulopevotomapa.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_off00006592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6592 5524 bytes
SHA-256: 31431ba376ad0af5da01b535e70076066d07a7dc0a9296971d8c5129af86c46a
font_01_sfnt_off00007848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7848 9920 bytes
SHA-256: b9b2e466e191bdaa2f9fb03dc0970bdfc45276b80ab53c13430dcaf34a26d20c

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