Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfcab5c07d39083…

MALICIOUS

PDF

42.8 KB Created: 2020-10-25 09:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 1c4b0119573898c8d09daf2a273d8516 SHA-1: 54f66001acb6fa8e850fda755f282dee7781f09e SHA-256: 0bfcab5c07d3908365b36b29a14a30efb6110b776c34a5efc5ff8cbe256c9f38
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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ttraff.link/aws?keyword=table+tag+in+html+with+all+attributes+pdf In PDF document text
    • https://dowamiwimeguv.weebly.com/uploads/1/3/0/7/130775936/3881568.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/2e108896.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/nokire_xuseropiw_busomowojonolud.pdfIn PDF document text
    • https://xurolimusogisuw.weebly.com/uploads/1/3/4/3/134395808/3d1b3874a4.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/jibigamefomoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5f8a2d03573f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5f8de29fc6009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_5f8d44eaeb91d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5f926404b092d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f8baebe30707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_5f92f0d8b64fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f8aa76e5a3c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f94a0ef56b18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5f94a92eb36ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f8b056b7975b.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000063a9.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000063a9.bin)
    • https://s3.amazonaws.com/kavitokolezub/52360565962.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/ramokutufakixup.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/argument_essay_gre_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3ed52c-2a52-487b-beb3-eb8429fc8140/1028044790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60aafe9-209d-4bb4-b136-55e407ac6b8e/32370026647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d73c2a-945a-4731-b1bf-38e5fbcef4b5/30241599201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5cc400-0582-4186-a1e0-c5389423e395/91379037028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e83fc06-0d01-4afd-bb1d-537828832cb9/tom_clancy_the_collapse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228cf102-1cb0-44e8-9f4d-8a868e4a1769/divigur.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 extracted file (font_00_sfnt_off000063a9.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A9 5636 bytes
SHA-256: d7b02a7e28f5091030ae2eff30ae9d44d269d5059ce1cfed6d44f8d3d01dadd4
font_01_sfnt_off000076b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B0 11816 bytes
SHA-256: 4154e8e2555be63413909f676a05fe2e0a54375bf975f226482cc3b541ecf336