Malicious PDF — malware analysis report

Static analysis result for SHA-256 02dc717c646b84db…

MALICIOUS

PDF

45.1 KB Created: 2020-10-07 22:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b692e440f6b1fe8b8368a7c2ffaa6f20 SHA-1: f9502d41366ede49d3eabe4359f4c1fe3356d97a SHA-256: 02dc717c646b84db0e0d1f64a8cd51fb18c4f184051b3754efd3146dd688782e
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing indicates it redirects to known malicious infrastructure. The embedded URL in the document body, 'https://cctraff.ru/strik?keyword=elements+of+music+straus+answer+key', is likely intended to trick users into downloading further malware or visiting a phishing site. 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=elements+of+music+straus+answer+key In PDF document text
    • http://files.mingzhixu.com/uploads/1/3/2/7/132740193/2396547.pdfIn PDF document text
    • http://darimafu.lollipopsisters.com/uploads/1/3/0/7/130740368/5cbcc.pdfIn PDF document text
    • http://files.arcadianvacationrentals.com/uploads/1/3/1/6/131606745/wineduloga.pdfIn PDF document text
    • http://files.trffoodshelf.org/uploads/1/3/1/6/131636602/pufikapoxutoga.pdfIn PDF document text
    • http://xefeberiv.zainebshaban.com/uploads/1/3/2/7/132740541/c60635b.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/1/0478/4760/4383/files/19904287722.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8200/6172/files/18711657486.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8320/5281/files/school_calendar_nyc_2015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9503/7854/files/reddit_laptop_deals_australia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0398/8128/files/boston_tea_party_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103b9535-171a-434d-9e8c-810612e44fe6/81892959821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e26604-364c-4962-8e3e-ad7a95d485d8/benalakuxuvirivawisojawi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0634/4868/files/kekexipuwiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9732/0350/files/trouble_directions_with_warp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4171/6389/files/zip_code_lookup_tallahassee_fl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9408/6310/files/for_the_beam_and_loading_shown_draw_the_shear_and_bending_moment_diagrams_determine_the_maximum.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_off000072aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72AA 5244 bytes
SHA-256: 0160127894ef37d3d7c890ec75fadad0ea8161d32303fa1ddfeca1261784140c
font_01_sfnt_off00008489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8489 10152 bytes
SHA-256: 12e0d34be06bd08db73d08ff6758f3c2e7e7cf112cb48d98bf470ae24127552a

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