Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d998cf37b0500a…

MALICIOUS

PDF

39.6 KB Created: 2020-10-25 22:31:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: b43b8b073a751d024ac857abd2662abb SHA-1: 097feef85b6f8d537f6807e33b4dc95efd1eb53a SHA-256: f8d998cf37b0500a723e09e66022d3394026641f08dff3a4d8dd01f25efaffa4
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/aws?keyword=nautical+almanac+2020+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_5f91360bb6344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_5f8e66c5d3b74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5f8cadfd20489.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/4145620.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/zajiwuzepepebaz.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/12a035ab08798d1.pdfIn PDF document text
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/buwowemitim-juritizidases.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/nekovenadavib-vuruxu.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/36ce80dadf8101.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/ladibimotiluwel-durepuj-refazixarubok-kokadasoxawub.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/semigibeg-fesofuzido.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/wonoti/tapagake.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/70387519103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5008/1690/files/assessment_center_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7832/3876/files/pavemegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3609/0269/files/pujaberabuwoganuzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9474/8573/files/mp3_player_speaker_built_in.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6658/4988/files/internet_download_manager_apk_for_computer.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_off00005ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC9 5268 bytes
SHA-256: 789e6ff821bbf41da0a86cfe555a3dc759116fe7456b0627e8d82f60742dd825
font_01_sfnt_off00006cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAB 10828 bytes
SHA-256: 03bb1cc8fcacd8397e144ded29eade6c116b443e4ccea8c5db3aae544eb3f39f

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