Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fa71365f0f125f…

MALICIOUS

PDF

48.0 KB Created: 2020-10-04 01:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d74efd4fcdd32acb18bc5e05f26e64f3 SHA-1: dba1388eb162a17e0b141cd8ffb479cda899d43e SHA-256: 75fa71365f0f125f23bc9562a3a1bb9024820892d8a0d827567f23f8867ee9de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document also exhibits characteristics of a link farm, with numerous external links, suggesting an attempt to drive traffic to potentially harmful sites. The ML classifier strongly supports the malicious verdict.

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 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.
  • 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=turbomachinery+books+pdf+free+download In PDF document text
    • http://xixeged.discoverhispresence.com/uploads/1/3/2/3/132302921/zalofi.pdfIn PDF document text
    • http://saleku.alabasterhousechurch.com/uploads/1/3/1/1/131164159/lizujafud-tirejusun-febevefebodusiz.pdfIn PDF document text
    • http://files.wonderfulpowerfulme.com/uploads/1/3/1/6/131606465/6961151.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/d512d14f-7be9-4304-afa6-2a2ea85b2029/72577478668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77d8d45-ddca-475b-b138-5187256a45a9/72828623560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bc1b06-5438-43fc-8f1c-54784028729c/laretanaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf8d6b4-2cb3-4aa9-94e6-3ed115b62058/66723713009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb8bd2b-b62d-4166-a9da-e658e59e117a/9845362713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32555968-3935-4b39-ab75-2583919af833/55977624861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cefe10d6-4d51-4404-a177-e0fc21e48972/bibaketorenofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481d9798-efdd-42ac-b275-9819631f4cb1/pizun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/cobb_douglas_production_function_partial_derivative.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5302/5946/files/on_the_rainy_river_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/opf_file_kepware.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4669/7122/files/rocklin_school_district_ratings.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000660e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660E 5744 bytes
SHA-256: cfc19d16f5a47407593bd41237cfd00d27efe74c6b80649eb6a71ef1009d2f57
font_01_sfnt_off0000797b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797B 2116 bytes
SHA-256: 2d35fe1b112251630f6c3e185fb4bf58c6327cea99f60afab3ca0473214b5b30
font_02_sfnt_off00008347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8347 14936 bytes
SHA-256: 92e0a4c359cd4cadf48aec73ee6698637c668bdce4ea74b15d595cb9c1e7367b

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