Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cef73489b24c27…

MALICIOUS

PDF

59.0 KB Created: 2020-10-08 11:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6a43dc00e1a02ab29a8d2c1fea6876ae SHA-1: 53ca57386a826efea9c25f77feb5d4e1a084c36b SHA-256: 40cef73489b24c2716ce204e86cc14ee6561c6b003b6e8e0fa0f48562ef0766a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm or phishing attempt.

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/strik?keyword=starfinder+drone+sheet In PDF document text
    • http://fafavi.projectfulfill.com/uploads/1/3/1/6/131606165/fujizadulukiro.pdfIn PDF document text
    • http://mugorexa.apostolicadventures.com/uploads/1/3/0/7/130739377/domiwa.pdfIn PDF document text
    • http://files.iananthonycoleman.com/uploads/1/3/0/7/130776718/9342694.pdfIn PDF document text
    • http://files.junoonperformingarts.com/uploads/1/3/1/4/131453919/morisevo.pdfIn PDF document text
    • https://site-1036760.mozfiles.com/files/1036760/folewaweji.pdfIn PDF document text
    • https://site-1036833.mozfiles.com/files/1036833/jugupumiwolutowukowifo.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/81580185642.pdfIn PDF document text
    • https://site-1038631.mozfiles.com/files/1038631/77359287060.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/1/0428/9580/2527/files/46014906418.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/4612/3937/files/mutivazezipuzepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/stateless_vs_stateful_firewall_aws.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2379/7911/files/texas_studies_weekly_vol_21_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8270/3257/files/cristina_raines_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509bdd31-714a-4425-987d-abea1fc31414/defipufobun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1adf213-7d1d-41fe-bc9e-ef63f1ecc3a7/98728009137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cff7576-f4bb-4b56-9739-ad2949d6b1ee/botab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a266c0-90e4-4d1b-b0e5-4b93f1b6881a/mobofijozapomute.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_off0000a2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2AF 5068 bytes
SHA-256: 24a8cf8958b78d3527d99b32b8e47ec7bbeb6f04cf00af46b6768d932fdb5afa
font_01_sfnt_off0000b3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 13836 bytes
SHA-256: 762280150c79a4f4099d57d9969a1dbda03c751fff12f854ee87d178938b71d1

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