Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b2c8322765ebbd…

MALICIOUS

PDF

44.9 KB Created: 2020-10-28 17:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 092066c81ad6499398eb9dd41f4b89af SHA-1: 661de9f9ca366c6e7b08c56a148695b37ad5b6c0 SHA-256: 01b2c8322765ebbdffaf23e6b1c5d39bd4fd59cf80515659e74b711509888162
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?keyword=wister+grade+school'. The document also functions as a link farm, containing numerous links to other PDF files, likely to obscure the malicious destination. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to harmful sites.

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/aws?keyword=wister+grade+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5f8ebbcfda5c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f897851aa8c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5f917ff078b09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5f986c7986765.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/1/0499/3122/3202/files/leisure_satisfaction_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/segolebopejopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941034d9-39fa-47e5-a374-fa672d534d94/59884407559.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/64133825458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560fbed1-8df1-4e01-b5bc-491fedbfe6b9/bojikatafezo.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/aws_certification_solution_architect_associate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55364961-60c8-4da8-80d3-64ae06b60b24/rizaxobegeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6444/2521/files/air_hogs_hyper_stunt_drone_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c18e139-16be-4d67-8a19-36376f186b62/87681188539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621eaf47-66a0-4ea9-ac38-edcd4e31688c/vuris.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4416/6049/files/zirefegabivanud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8696/5672/files/vance_and_hines_fp3_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7548424f-e889-41a7-acb4-0d175018bced/sip_of_ravage_magicka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b936cc6-30a6-4a1f-bec1-36439fe26fa7/hottop_coffee_roaster_kn-8828p-2k.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_off00007125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7125 5216 bytes
SHA-256: 835c5b77059e6357205fd109270a564bd92e29d8fd1c3e072d508da53519af9c
font_01_sfnt_off000082e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E6 10536 bytes
SHA-256: 26218b669a71db2151e63981ffe6d369687328e75a0152209d7d4493394136ac

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