Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37899c8e28a0d92…

MALICIOUS

PDF

42.4 KB Created: 2020-10-14 22:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c2bee4690722f32fe50174381333e4b1 SHA-1: a90ae7bcbb94b25533608e9def99ab5f3cf6d245 SHA-256: b37899c8e28a0d92655ed3e0c44b9c19afe78f2c435734a311bed63119c6dc84
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=android+tv+box+browser+apk In PDF document text
    • https://site-1038864.mozfiles.com/files/1038864/22776629248.pdfIn PDF document text
    • https://site-1048260.mozfiles.com/files/1048260/vejur.pdfIn PDF document text
    • https://site-1040135.mozfiles.com/files/1040135/95379677117.pdfIn PDF document text
    • https://site-1041090.mozfiles.com/files/1041090/91883721688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f872343bc043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f874789f1138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f871de4b3630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f871c9a5996d.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/5665029.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/5d6f2da.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/topexukiguf-nulakekez.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/b354eb66-3e79-40ba-9c4d-743ef4e724da/25970642680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19cc649a-8d2b-4965-ad99-96c818f377b8/63141379929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162ecf3c-bd46-4208-9f47-841260a4bf0d/26492124907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c451fc-d2ba-462a-91cf-d11f2526d4e1/26965276031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e467adfc-d34b-4373-99ad-cd6e35decf17/67289669579.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0205/0978/files/what_is_a_healthy_lifestyle_diet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9301/5195/files/5e_players_handbook_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7157/8007/files/84484680861.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4246/2618/files/solving_quadratic_review_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9595/4086/files/5119151352.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_off0000672f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x672F 5336 bytes
SHA-256: 41116f152a0daba55addb2c4b78999d9d1a8f0e79852d34edb0bae201638d3e3
font_01_sfnt_off0000797a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797A 10192 bytes
SHA-256: cca67cd7faa4e107b685cd829cdc8cf339f873769c167c6b695e949f33653c6e

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