Malicious PDF — malware analysis report

Static analysis result for SHA-256 463c6695d596f056…

MALICIOUS

PDF

49.4 KB Created: 2020-08-17 17:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2940ad370de1f76ac171d1b16c86bb2 SHA-1: f8156d124710fd555ce5c96fd48662926a47122f SHA-256: 463c6695d596f056a308f764e8870413a4c8761312cbbf47d43932cb410b0fbc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=gastroenteritis+management+guidelines'. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded 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://ttraff.ru/pify?keyword=gastroenteritis+management+guidelines
    • http://files.midwoodtreebanding.com/uploads/1/3/0/7/130775823/daluxidoduxagaw.pdf
    • http://files.sarahparsons.ca/uploads/1/3/1/3/131378776/9188199.pdf
    • http://files.kcsfinestsportscards.com/uploads/1/3/1/4/131410952/dozafes-bevivej-gijis-zusegimebaxik.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1655/files/ashwoods_electric_motors.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/rewibuga.pdf
    • https://cdn.shopify.com/s/files/1/0432/7889/3214/files/23551763003.pdf
    • https://cdn.shopify.com/s/files/1/0428/9652/3423/files/neon_trees_animal.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/fraps_download_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/capital_structure_in_financial_management_notes.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/nunodu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/agendas_personalizadas_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6815/files/ncic_code_manual_2015.pdf
    • https://cdn.shopify.com/s/files/1/0438/5079/3110/files/37694774580.pdf
    • https://cdn.shopify.com/s/files/1/0431/5512/8480/files/51900262591.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vololo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/75619128339.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5671/files/jomotegukonaj.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078ef.bin
eeb150c6c7e2477b685d7dc10585e4ec3601a8c415d837c519b3e40efb31c0d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EF 5176 bytes
font_01_sfnt_off00008a72.bin
7e35c8cb5a989bfa875321549ec8a0bcc9f392e5d214a56e99e278eba029ae33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A72 14712 bytes

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