Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fa91a879cbf34b…

MALICIOUS

PDF

40.8 KB Created: 2020-10-30 05:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d79284092f25a6a2d8637af96f3b78eb SHA-1: 7f1c76d193e40c642caaa8f9d7aca706a61ed986 SHA-256: 70fa91a879cbf34bb9f42bc05350b333b98e60f650887e31c4b1e744ad7b3f3c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.club', which is used to obscure the final destination. The document body contains obfuscated text and a reference to the malicious URL, reinforcing the malicious intent.

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://ttraff.club/123?keyword=destiny+2+precision+kills+farm In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f8b06ce5585e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5f9767f7a79f0.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/1/0502/1741/8942/files/72012693548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cfb470-c812-437a-9001-75fde506dd5e/mortal_kombat_dc_universe_fatalities_ps3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0869/4171/files/feteduwozufezuzagipeneboj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0892/4071/files/common_verbs_followed_by_gerunds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e39d3cb-36f1-4429-83d0-8b930eaa5205/88950771882.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8645/0328/files/96087544059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29eb905d-4fe4-4cb4-8c8a-142e950125ec/little_witch_academia_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e341c53a-7dbc-4738-95f5-2004d633f480/69832784294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2927/8119/files/rotonogeminowanavopipub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452ef28b-eec2-4def-8f85-d26ab23b1c8c/sleeping_barber_problem_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f19b05a-dcf8-48c6-bcab-6a28e6a7af7d/senigebof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b52f9c-3aa9-44a5-8b4b-d8970e9ff351/20505320151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/048e02bb-21b6-4446-ad07-d0b19a7f2559/sivunuseratav.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/it_chapter_2_full_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/vefodiwofovinipedit.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_off00005f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F91 5456 bytes
SHA-256: aeab5983d200754fb61384eae428e3f22f5f9725d58a5b6683eadda22a1f64c2
font_01_sfnt_off00007227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7227 10620 bytes
SHA-256: 8c6866119ea4c18fd99758a0d0894aeafb9b8e326756715215ecfcf01ec1d586

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