Malicious PDF — malware analysis report

Static analysis result for SHA-256 1110168cfface8fc…

MALICIOUS

PDF

40.6 KB Created: 2020-08-24 09:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f76f3043c92537ede23ace746369871 SHA-1: c47257dcc4f6aa6a650f11fce2e9292a3c116e91 SHA-256: 1110168cfface8fcf3a6638d0de486e1f51fe17dc62e7e7b451e8a193732bf93
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to improve search engine ranking for specific keywords, a common tactic for SEO spam. The primary malicious URL is 'https://ttraff.ru/pify?keyword=washington+food+handlers+permit+test+answers', which is likely used to redirect users to further malicious content.

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=washington+food+handlers+permit+test+answers
    • http://kugivivog.ritecookware.com/uploads/1/3/1/4/131453960/f43badd.pdf
    • http://lekagarup.tcjff.com/uploads/1/3/1/4/131409474/wuvumomodumamede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8686/3783/files/60264864546.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/vewenuwonelelemivid.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0395/files/life_s_unanswered_questions_funny.pdf
    • https://cdn.shopify.com/s/files/1/0461/0690/2691/files/desasavuwagifetaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0088/8483/files/star_wars_cantina_song_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9048/files/awdhesh_premi_ka_bhojpuri_song_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/highway_to_heaven_season_5_episode_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/cs_source_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41557636134.pdf
    • https://cdn.shopify.com/s/files/1/0432/4163/5997/files/39626905699.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_off00005e11.bin
79bf773908fde7a6eca047013818427e13b471269a1f21b4e96e7bc7a56d4aa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E11 5560 bytes
font_01_sfnt_off000070e2.bin
2ff821c1d930b55b7ceb907a6150dc534dabff31ecd5093583f7b3a4f8591ab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x70E2 10760 bytes