Malicious PDF — malware analysis report

Static analysis result for SHA-256 870f5b0c03fabc97…

MALICIOUS

PDF

40.8 KB Created: 2020-08-19 12:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d62527b692f74debd245af63fcade240 SHA-1: 3bbba1b9faa0e2d8b0ae8a80df686195f96b8d67 SHA-256: 870f5b0c03fabc97e8c349467932e498f538856d726f21bb57d6758dfde2023b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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=idiomatic+expressions+with+tener+quiz%2523+1+answers
    • http://fanemumaf.thewindmillhillfarm.com/uploads/1/3/1/4/131437792/wabitofumifisalelet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/6389/4173/files/job_application_form_format_in_word.pdf
    • https://cdn.shopify.com/s/files/1/0430/4342/2362/files/pipevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1834/6915/files/epilepsy_action_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/jukadivi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9305/6933/files/dabapafakolevokeradaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3556/files/51334071267.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/83138911974.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/20818684744.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8733/files/87324359727.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4637/files/online_to_jpg_splitter.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_off00006100.bin
28ad14a21d57210046cf4186b00ba4e17ca1dbf2ac13dac60ebf2438cb8bd069
pdf-font-stream PDF embedded font (sfnt) at offset 0x6100 5556 bytes
font_01_sfnt_off000073cf.bin
ff53466f1fa7f0fafea3319f5df73cb004fe7095e31ed8b884631d8243669285
pdf-font-stream PDF embedded font (sfnt) at offset 0x73CF 10128 bytes