Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ef4485da971642…

MALICIOUS

PDF

42.0 KB Created: 2020-10-02 03:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 683e873b417144e059c0413e19243dd9 SHA-1: 62281cf83c4e0f0e5d81d5db9c84c57775d4eaf4 SHA-256: 39ef4485da9716429705ea642d736ae04c27c5421f92695fdcec65dcb8357385
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. Crucially, one of the links, 'https://gettraff.ru/strik?keyword=april+girls+mag+de', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure itself facilitates the attack by hosting these links.

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=april+girls+mag+de In PDF document text
    • http://pomipufov.devitadiamonds.com/uploads/1/3/0/7/130739343/tolomimewevi.pdfIn PDF document text
    • http://gaxile.abodeinteriordesigns.co.uk/uploads/1/3/1/6/131636601/kugalopakaveg-zimela.pdfIn PDF document text
    • http://files.jtmwebproductions.com/uploads/1/3/1/6/131608017/d0d1e43739a.pdfIn PDF document text
    • http://lumubor.room4love.org/uploads/1/3/1/3/131379732/muxej-vavot-rikepikimuv-vufomovesute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/admiral_washing_machine_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2430/4286/files/hello_kitty_baby_playpen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8394/6401/files/kejosulepedizetelajuni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2323/9848/files/xuwosiwuru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7453/4041/files/infp_and_enfp_match.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6910/0198/files/riddle_whose_answer_is_soil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2947/9072/files/lemobaxuwadiwovexasexu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7524/2657/files/barozubuxuruwavorivoxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5427/6001/files/8333158087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ca83d7-d820-46cd-b794-3683539b0cf9/dogil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231652f3-15c4-4bae-8e9c-ba8dc038be12/39723626190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d3636a-cdd3-46c9-b70c-96f54bf29797/93284282780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99add36-aa91-46a5-9bdc-5c5dbdc20c1e/tanefusezakalesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ea19ca-596d-4c87-ad84-7b811dcb7f50/mazuxilatakekot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5665 4760 bytes
SHA-256: d735f57ab3231925e1e36fed2b90a79b367c64dd13b64c298eee58ed8334d9fe
font_01_sfnt_off00006678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6678 11876 bytes
SHA-256: 8b55b7392ee960ab85da50e869bdb298b1baab9a1a2ad5c83fc9af1c47bb8e1a
font_02_sfnt_off00008d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D63 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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