Malicious PDF — malware analysis report

Static analysis result for SHA-256 59640777994c3c6c…

MALICIOUS

PDF

41.6 KB Created: 2020-10-01 13:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7aa0aa8b7378558d77fc17900c2e2d57 SHA-1: f840e822c8b6ffd7d0439bcb1ad0c577a51f8f5e SHA-256: 59640777994c3c6c84fe9dd158bff8cfb2165aa099b8590dc4c4db44ff507e6e
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, including a primary malicious redirector at 'https://cctraff.ru/strik?keyword=facebook+audience+targeting+pdf'. This indicates an attempt to direct users to a compromised or malicious site, likely for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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://cctraff.ru/strik?keyword=facebook+audience+targeting+pdf In PDF document text
    • http://files.butleralabama.org/uploads/1/3/2/3/132302824/fezis-kitozi-turesu.pdfIn PDF document text
    • http://matabi.grayhawkpto.com/uploads/1/3/0/9/130969644/lixotiwopizov-moxeda.pdfIn PDF document text
    • http://files.the8blockfitnessstudio.com/uploads/1/3/0/7/130738700/2023a845640842.pdfIn PDF document text
    • http://files.victorjoelortiz.com/uploads/1/3/2/6/132680986/lixidapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7258/5881/files/naxukalezigejowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8212/8291/files/town_of_ithaca_highway_superintendent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/defijetewinenuvag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6330/3575/files/52375599100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2499/6759/files/kendo_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5464/4894/files/subarachnoid_hemorrhage_guideline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/lofawib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/2451/5989/files/lomewanafejinewezoxop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/3200/9893/files/11974662741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/8319/7603/files/administrador_de_base_de_datos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6303/0172/files/65_inch_tv_best_buy_uk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E3 5272 bytes
SHA-256: b9c658adf90af5747af7461df982b623ef8c64ecb7cb17731a87ff1241144116
font_01_sfnt_off000075e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75E5 10380 bytes
SHA-256: dca1b2d5decb3f2dc89d02ff5ec67ba1e5b5b1a93341f72a37e1f87a7384b533

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