Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d899c1b98679709…

MALICIOUS

PDF

42.7 KB Created: 2020-08-01 21:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1af0248dfff05c9e4f8095648ac422ea SHA-1: 80339c157b4799958976e378820661dd97867d11 SHA-256: 7d899c1b9867970966c751798a814b4b5205ab2335e0b35bc9b2a2307229e971
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=dijkstra+algorithm+python+3, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise its malicious nature.

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=dijkstra+algorithm+python+3
    • http://files.my-spiritual-garden.net/uploads/1/3/1/3/131379111/bezobose-nigamebul-mevefawaw-najolilu.pdf
    • http://files.thesweetfarm.com/uploads/1/3/1/3/131382590/8099358.pdf
    • http://files.kcorneliusimagesandmarketing.com/uploads/1/3/2/6/132681201/0f9e1c4b844779.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6809/6661/files/jojowiwabif.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/farotobirifurikimoxudi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3733/3406/files/koxunovalidamotirikurazof.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/lezuzoxevekepabez.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/xagasetewagewe.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/35107069794.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/84995996615.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/fuvofowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6910/files/21348488376.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/32692110184.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/dizodomaxepaduvum.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/strike_the_blood_ex.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_off0000620c.bin
e3ac695d7ffb291753d371807b04a6b9af753a659ed59cfe870b92d24a5c4ec3
pdf-font-stream PDF embedded font (sfnt) at offset 0x620C 5640 bytes
font_01_sfnt_off0000752a.bin
5203a3156102f5f4aea31da1a9a6a25590a24b7e64a2ce62de6d5ad0bbcacf9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x752A 12692 bytes