Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdf9bd05b4495bb…

MALICIOUS

PDF

52.8 KB Created: 2020-08-21 09:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2fff5c69c9e7abaa3e34ce589c94f31 SHA-1: 6421a1e771d1e755a79a98ce71b3c9902651a261 SHA-256: 5bdf9bd05b4495bb4b2f5a0f26ddaf0135ca029737a1fc4bbb708fa1d5ad58b1
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 Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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.com/pify?keyword=vrealize+orchestrator+coding+design+guide+7.+6
    • http://files.atlanticsafe.com/uploads/1/3/1/3/131379047/lowadokawamikolozita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/0896/2210/files/functional_areas_of_business.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/mifeselux.pdf
    • https://cdn.shopify.com/s/files/1/0448/0047/5293/files/advanced_accounting_multiple_choice_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9547/files/26408623561.pdf
    • https://cdn.shopify.com/s/files/1/0430/9234/4993/files/jopulonusixuse.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54344474436.pdf
    • https://cdn.shopify.com/s/files/1/0438/5082/5893/files/destiny_2_resources.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5621/files/19105101525.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40323832667.pdf
    • https://cdn.shopify.com/s/files/1/0436/9226/1529/files/new_bhajan_video_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0430/6835/8807/files/paxej.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000895e.bin
9c21a278b8132a0ba404287fcf5269a7e30750f785d232aa2b86ab61dd30578f
pdf-font-stream PDF embedded font (sfnt) at offset 0x895E 5484 bytes
font_01_sfnt_off00009c0a.bin
46db13c607d12e71c06577ffa0213b79178998a44b3b838965a3a6141a2e84a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0A 13144 bytes