Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1086a9b9c20c11…

MALICIOUS

PDF

40.6 KB Created: 2020-09-01 11:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad808008eaafdc16eaeaa3a8c84a03a SHA-1: 0d091803056cec21f5167b641ca9bafe7fe20c3c SHA-256: 0c1086a9b9c20c1156e4d5f7100b586f7c1b9e3c7fe356cab270075d3a67dbb3
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=voice+recorder+for+windows+7+free', is flagged as a known malicious redirector. The document also exhibits characteristics of a PDF SEO link farm, with numerous external links, suggesting an attempt to drive traffic to potentially malicious or deceptive content. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful websites.

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/wix?keyword=voice+recorder+for+windows+7+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3d0627_20e41280913447c2a8b9716797afb0dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_cda46ba4730747419bd7f9e1bb3a2070.pdf
    • https://static.usrfiles.com/ugd/cec570_babaa4eea7474e84999c21d488ecfaf9.pdf
    • https://cdn.shopify.com/s/files/1/0448/0113/0645/files/nogidofuwefumufidonavup.pdf
    • https://cdn.shopify.com/s/files/1/0439/7491/8302/files/reporting_mediation_analysis_spss_process.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/51223452111.pdf
    • https://cdn.shopify.com/s/files/1/0462/7742/7349/files/annadata_bengali_movie_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0435/8363/5619/files/20978206758.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4010/files/zupofodaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/12906046584.pdf
    • https://static.usrfiles.com/ugd/804ff6_2b71b6b5d80845238b6115706e79ef95.pdf
    • https://static.usrfiles.com/ugd/b8c837_94a734d428014021b55e1f01f855b377.pdf
    • https://static.usrfiles.com/ugd/15cd4d_0868f0aebb8d48379cd6cc33c2fa00d0.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_off000061fa.bin
d03813f2d1b09c1bed580eb7459a40abf10286adc1d98182a3e9ad138d8b98e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 4908 bytes
font_01_sfnt_off000072e0.bin
f0835a64c1f46ccee3167cb77880dc92ea367b5fd057f13363aa76c452d282c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E0 10136 bytes