Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa8b164db0031e3…

MALICIOUS

PDF

46.7 KB Created: 2020-11-05 16:28:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 437c24450152b55b09ba94ce4dea3fa4 SHA-1: d00a9dd1b611d1cc7fef1ef6da61cefe9f87b3f2 SHA-256: 4aa8b164db0031e35e57f1ba90928fcf0a73757216a3f818a56b1b9b6bcb9c67
194 Risk Score

Malware Insights

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

The PDF contains a lure suggesting it provides answers to a technical quiz, directing users to a malicious URL. This is further supported by heuristics indicating a malicious redirector link and a browser extension installation lure. The presence of numerous embedded links, many pointing to S3 buckets and Weebly, suggests a link farm designed to distribute malicious content or host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffmen.ru/strik?keyword=packet+tracer+navigating+the+ios+answers In PDF document text
    • https://sevivuninuk.weebly.com/uploads/1/3/4/4/134459749/mepolavajixilixamuj.pdfIn PDF document text
    • https://rizidapovo.weebly.com/uploads/1/3/4/3/134316848/00e7c36a69d.pdfIn PDF document text
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/1664741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5f941c5f0e2f7.pdfIn PDF document text
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/bc9b92c645567.pdfIn PDF document text
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/f78d8.pdfIn PDF document text
    • https://vataviborabedim.weebly.com/uploads/1/3/4/0/134012391/dadonosafosaziwun.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/zarelusipofox/losuwitizojomuvowemero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee9f83b-bf1e-404a-bfe7-4138b3a210f8/cpm_int_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/59131290343.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/lemufemawakuromef.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/zobedebigil.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/mevusixixuruf.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/chemistry_equations_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47df9c61-aeef-4340-8e84-bacf556c224f/nunetumaluxajigib.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_off00007781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7781 5244 bytes
SHA-256: b5bf1e569d61cf14f8ca7000f1b229030d212a6cdd1ba0c75de4a2f74264d59b
font_01_sfnt_off00008969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8969 10732 bytes
SHA-256: aa1a1947a5612284b54b3325ce69dafa619cae7c3c9ab5b02f12c5b61019f892

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