Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35adf9ef93d0301…

MALICIOUS

PDF

44.5 KB Created: 2020-10-06 10:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 5cda18cab8a6f513aae51f81f6974d32 SHA-1: 309b3d7f3d62daf9e5ea175a569ca9ada4aa17f2 SHA-256: c35adf9ef93d03011a62c15e9fc0c2c8d6549b200d8f701d26fabd3fe163ed97
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://cctraff.ru/strik?keyword=international+business+book+pearson+pdf In PDF document text
    • http://files.omearasolar.com/uploads/1/3/1/3/131398008/07a15f33f.pdfIn PDF document text
    • http://letirej.jaynestringer.com/uploads/1/3/0/8/130873876/7315400.pdfIn PDF document text
    • http://files.tropism.eu/uploads/1/3/1/6/131637589/48fab4e4a128a5.pdfIn PDF document text
    • http://keburusu.anavantage.com/uploads/1/3/1/4/131437299/zanomaped.pdfIn PDF document text
    • http://safefi.allthingsnewvizslas.com/uploads/1/3/0/7/130740522/puranawat-wewoxi-siforozam-vutefe.pdfIn PDF document text
    • https://site-1038650.mozfiles.com/files/1038650/34582112991.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/1/0465/3921/0911/files/toto_drake_ii_1.6_gpf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/brave_little_toaster_goes_to_mars_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878ea03f-73b5-4d57-be7b-f0fb44ffc3e0/lavam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27afb698-9e1f-4e2f-8f09-ac75861fc00e/9880410146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25af9ff7-5030-4ec3-aa6c-40b570276acc/50274606150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a3bd6d-df97-4fcf-a47e-9a8faab24e43/49149488549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5f4b49-6fff-40cf-833f-57a0aa0c4fc8/69162985807.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_off00006c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3F 5176 bytes
SHA-256: 969751cecba87437876aa1fac6a65d02472fda200e69234a7d733d3c2339a2c8
font_01_sfnt_off00007de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE0 10900 bytes
SHA-256: a1e64f4c367404a50bd370d91f975f8ebe225b3fcaa777956a871968f83022b5

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