Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a5e3d088eb9140…

MALICIOUS

PDF

50.7 KB Created: 2020-08-17 13:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59841eef6f181217a2875d0892be2adf SHA-1: 75958bff4cb940c88a9b87c221dec33cc98fe6ae SHA-256: 75a5e3d088eb91403e2c3d1ee897016f97bba576003fec7327d2eda9f290449a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lead users to further malicious sites. Additionally, the document exhibits characteristics of a link farm, embedding numerous external PDF links, many of which are hosted on potentially compromised or low-reputation domains. The ML classifier strongly indicates maliciousness, supporting the conclusion that this document is part of a phishing or redirection scheme.

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=algonquin+college+library+and+information+technician
    • http://files.holytrinitylowmoor.com/uploads/1/3/1/3/131398369/7433288.pdf
    • http://files.daupo.com/uploads/1/3/2/8/132815008/sakarek.pdf
    • http://files.jasonmoliterno.com/uploads/1/3/2/8/132815123/jotafuxipigivav-pejiwavojosaxu.pdf
    • http://davug.pvgtf.com/uploads/1/3/2/6/132695818/dipifuvuxezasev-muxopokag-pezezajuk.pdf
    • http://files.inspirednourishment.ca/uploads/1/3/1/6/131607062/josudabe-levaziwise-saronalasak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2650/5128/files/math_worksheets_grade_4_angles.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4555/files/vozakimajodoza.pdf
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/lockout_tagout_steps.pdf
    • https://cdn.shopify.com/s/files/1/0430/5970/8058/files/visimakegavuzulafava.pdf
    • https://cdn.shopify.com/s/files/1/0444/0604/6886/files/42705465928.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/application_vnd_ms_word.pdf
    • https://cdn.shopify.com/s/files/1/0440/7482/7941/files/43643909248.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/21195382628.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6249/files/wii_u_usb_helper_unpack.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1592/files/34143631688.pdf
    • https://cdn.shopify.com/s/files/1/0432/2682/4859/files/jordan_canonical_form_of_a_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0433/7198/7098/files/the_castle_of_cagliostro_kissanime.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_off000085ae.bin
59e35ea97d519077cc2c5bc60e5ff48e2cc353349f4494aa977e9e76171fa3ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85AE 5616 bytes
font_01_sfnt_off0000989a.bin
665ed7073f177913557be6b1cc1a5b14451d9034d1b7030137496ac4cfd0fb81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x989A 10764 bytes

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