Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfb0530bfa3480d…

MALICIOUS

PDF

30.5 KB Created: 2020-11-05 14:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fc926ca68d8b5c47d6c8564089d93835 SHA-1: 2e2ba802ed26eed8e3212cf916ff162478a76225 SHA-256: 7dfb0530bfa3480d0fea7fff12b27f7dc723f36147c9be5b8f5ab4b488112367
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm designed to manipulate search engine rankings. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://gettraff.ru/123?keyword=google+docs+movie+salt`. This suggests the document's primary purpose is to direct users to malicious sites, likely for phishing or malware distribution.

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://gettraff.ru/123?keyword=google+docs+movie+salt In PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/rebeguwawuvadepipo.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/147c1c7e-aa40-49c8-8755-980dd5b77fa6/takulatifibibojadokimur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d23834-3a01-4065-810e-c338aa962ae9/gavovaxajuvokoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c901d54d-db0c-4afb-a4f9-ff2aa1d2cf89/33277802444.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9925/8022/files/navogibu.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/gujebebop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa655b01-838f-4971-a0a7-7ea8eee198ec/63303870771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6bd1782-18c6-49d3-b0c6-612d748b7aad/vuvan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0647/4419/files/42379457176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7017aab7-4bc3-49de-8386-36fd635e222d/40418817748.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_off00003f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F5D 5256 bytes
SHA-256: e331a559d03a01fdc2cdc8d866c1bbcf11072d10fe58bafc33fe314a88389a31
font_01_sfnt_off00005139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5139 8384 bytes
SHA-256: f14b06411bddfe136c088f5eea949c949b6ecd91a9e16e9c99e5fa4f13b2141d

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