Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fde9b1044750ea…

MALICIOUS

PDF

42.0 KB Created: 2020-10-17 11:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 1ae0a436a556490788ebcd879b524290 SHA-1: 6d8799290a8103d85ff7e9c7d6a34867ba72fceb SHA-256: 81fde9b1044750ea8dcb3473d41625310bac193fba15aa08e33f9dc52d841fb8
184 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.
  • 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://ggtraff.ru/123?keyword=test+your+chess+iq+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5f89470079633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f8a48f3f16d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f890f7ca78c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f87d118c1b12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f87bf8552d67.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/382aef3a93439.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/jokokivupekimimedu.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/1ab7d5995e84a.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/zipape.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/niraso_fawativurobit.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/aaf20a05-c8b9-46bb-bc10-74d13d675688/jalogupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7e067fc-df8f-4e82-82dd-554f62fb3501/80836817161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cccdaf68-20d5-430a-8811-0e3070872f4e/495475150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8b561b-2e10-43a4-a54f-091d8c64bd6e/jujug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7410f5-caf8-41a1-8603-7d2d4da38e7c/rujutedetuwato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/5027/1388/files/faceing_math_lesson_17_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4157/8405/files/nexesusovisewajefaku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8031/9645/files/dahon_speed_uno_folding_bike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0118/6973/files/what_happened_to_the_cast_of_in_the_heat_of_the_night_tv_show.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_off0000657d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657D 5512 bytes
SHA-256: 03ab82d011299cb1e671238f865146d51e0b9df6734ed77539a63bb9b3eea62d
font_01_sfnt_off00007853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7853 10200 bytes
SHA-256: c210553981c0170a74ad34b6f79b4e99c90c14a61ed869c13a874adad6e93a6a

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