Malicious PDF — malware analysis report

Static analysis result for SHA-256 8423762895d8a02f…

MALICIOUS

PDF

34.1 KB Created: 2020-08-25 18:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2135fbe00c6c1538899bec956af8e97 SHA-1: f74f4649eb03e69c701aa765e2ce13a8004e43d1 SHA-256: 8423762895d8a02fd74fbf57d49ab612e3195d057457e66fe09662ada5b27504
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is used in a lure for a song download. The document body also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=drake+controlla+song+download
    • http://numexi.kramercorey.com/uploads/1/3/1/3/131398504/luluzisupadifuzova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/antiarritmicos_clase_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/emotional_intelligence_research_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/6082/0133/files/invitation_birthday_party_free_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/5747/8809/files/23227248149.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3986/files/18834360299.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9163/files/ship_of_theseus_movie.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/raparikewafewajepeno.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3282/files/97367332366.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/gelagesijozebuseb.pdf
    • https://cdn.shopify.com/s/files/1/0439/1891/7787/files/42638000985.pdf
    • https://cdn.shopify.com/s/files/1/0434/0026/5878/files/32691744439.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/synthesis_of_chalcone_from_acetophenone_and_benzaldehyde.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_off000047a7.bin
c042c2775a3856f9d9f7c9baf3c17f09649d528edafb74716aca4dcbe1af6346
pdf-font-stream PDF embedded font (sfnt) at offset 0x47A7 5260 bytes
font_01_sfnt_off000059a7.bin
c44656ff31c4fb0f96cd4e677744ff5afa97242c0f71c830245a50694f5038b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x59A7 9952 bytes