Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b24faf968e9fa39…

MALICIOUS

PDF

51.7 KB Created: 2020-08-26 06:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e1feb3932fe59fee036b4395bd1f8ab SHA-1: 2fe8910f9a417012b44570ce37469abba49194e0 SHA-256: 0b24faf968e9fa39f567243fd837f510375f9cf08f92746646b98ad4da60257b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=part+catalog+yamaha+rxz'. The document body, though partially corrupted, also contains this URL and appears to be a lure disguised as a part catalog. The ML classifier strongly indicates maliciousness, and the presence of many external links suggests a link farm or SEO poisoning attempt to drive traffic to malicious 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://ttraff.ru/pify?keyword=part+catalog+yamaha+rxz
    • http://files.kathyfriend.com/uploads/1/3/1/4/131409717/5820037.pdf
    • http://files.cffu.org/uploads/1/3/2/6/132683111/bazakekukaxatiwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6462/2246/files/tosajejetivuwupeguwuro.pdf
    • https://cdn.shopify.com/s/files/1/0453/8921/7960/files/61021475330.pdf
    • https://cdn.shopify.com/s/files/1/0437/6553/0785/files/overstreet_comic_book_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/4001/2450/files/81660027261.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/urticaria_multiforme_images.pdf
    • https://cdn.shopify.com/s/files/1/0432/7306/0520/files/ti_sao_file_khng_m_c.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1767/files/cells_alive_webquest_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lexopiwalosadatijasaz.pdf
    • https://cdn.shopify.com/s/files/1/0451/2812/2521/files/body_parts_in_spanish_printable_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/aquilegia_formosa_usda.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/63846827652.pdf
    • https://cdn.shopify.com/s/files/1/0432/1945/2072/files/42_impossible_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/5228/3542/files/daido_engine_bearing_catalogue_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007230.bin
5eb1b630edb62d85f68f6462c04c4066166522845d6aaf2e46018d2569023f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7230 4772 bytes
font_01_sfnt_off0000826c.bin
ca4d436ac654482bc3be2342159557700bdda5d2263da3937c711f8183ba887a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x826C 16404 bytes
font_02_sfnt_off0000b380.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB380 4324 bytes

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