Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e25699b6408965…

MALICIOUS

PDF

23.4 KB Created: 2020-10-28 13:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ae80e54905abb8151cf966d048d0636d SHA-1: 86a75f8ebd9c8d236cff766f70513821f3f11e38 SHA-256: 39e25699b64089656631ee0dfa94305ffe10958ec9adcc4ecfe6b4e3a4604760
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDFs and a redirector URL. This behavior is indicative of a link farm designed to distribute traffic to potentially malicious sites or to obscure the true destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=what+is+the+similarity+ratio+of+areas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f8cfe4b577a8.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/5ed5dc07.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/midezimaboditanut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f8cb18de1330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f9936d5ca04b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f9711968a5b5.pdfIn PDF document text
    • https://suranetu.weebly.com/uploads/1/3/4/4/134458043/xizezamo-xuxetajel-xinigozitarujo-wopovaw.pdfIn PDF document text
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/9143492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f86f4032a597.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/03d3414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_5f982243b6998.pdfIn PDF document text
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/nurulogigiropikejemo.pdfIn PDF document text
    • https://dexixafavako.weebly.com/uploads/1/3/4/3/134348567/5276199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2260/6759/files/1_2_inch_steel_rod_lowes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/9329/4749/files/ecg_interpretation_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0124/9444/files/31434322108.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7634/1926/files/wet_t_shirt_relay_race.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3066/6651/files/crusaders_of_light_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2077c8-b0b6-4dfd-847c-ce03746afafb/woruvumud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b4f2b5-cece-4b6f-8e6a-7aaeda5b48e4/86927530515.pdfIn PDF document text

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