Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa1cad47bdc0dc6…

MALICIOUS

PDF

49.6 KB Created: 2020-10-21 06:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ab80b2a98c476aba5991bfaa7d2390ba SHA-1: 50ca8779f6a0870235e669deb54e67620347417e SHA-256: 3fa1cad47bdc0dc606b850d5b32cb56b775da85e80e958d5e426a5e4fb6a59dd
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, masquerading as a link farm for various documents. One prominent URL, https://cctraff.ru/wb?keyword=conan%20exiles%20cheats%20single%20player, is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs supports a phishing or redirection attack pattern.

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/wb?keyword=conan%20exiles%20cheats%20single%20player In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_5f8f93b8ab60f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_5f8dab3ba17c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f88f81e2c4eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f882e6cabaf0.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/45973f8adf7.pdfIn PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/6263493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5f88bed926843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f879aecacc8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5f8d6de160bba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5f8a702abc5f2.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4867245.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/9223385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadovu/aptitude_test_papers_with_answers_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/21175372712.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/arihant_current_affairs_2018_free_download_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/zizixid.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_off00007973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7973 5268 bytes
SHA-256: 1c276fdf0d71f1cb80b79d0ddcaddb90a7df9123d765bed812e53f1051aae226
font_01_sfnt_off00008b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B61 14336 bytes
SHA-256: a9f21520bf2d6eb5eb7bd5bc56d0bb12ae320b0f99c92fbb44efda3658a0c8e3

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