Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc93ec64ee8b1b3…

MALICIOUS

PDF

70.7 KB Created: 2020-10-11 00:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aade745387ae565439c60c2f0fa7ecf3 SHA-1: 73c327acdba41b659f93affb7bcbb8abd78f7f81 SHA-256: 8cc93ec64ee8b1b317f44c4827367c69fbeadf99d733d56574ac07819de992d3
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary URL, 'https://gettraff.ru/strik?keyword=brett+johnson+robin+hood+died', is flagged as a malicious redirector. This suggests the document's purpose is to drive traffic to potentially malicious sites, likely for SEO spam or phishing campaigns.

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.
  • 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.
  • 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://gettraff.ru/strik?keyword=brett+johnson+robin+hood+died In PDF document text
    • http://gixuwa.thurstoncountyrw.org/uploads/1/3/0/7/130739663/sabuxozal-zutewavagosiki.pdfIn PDF document text
    • http://files.bavardmusic.com/uploads/1/3/1/3/131383581/4170713.pdfIn PDF document text
    • http://files.nicollaslittleshop.com/uploads/1/3/0/7/130739827/1727796.pdfIn PDF document text
    • http://files.pcdr-gesves.info/uploads/1/3/1/4/131407370/634461.pdfIn PDF document text
    • https://site-1048288.mozfiles.com/files/1048288/88391562789.pdfIn PDF document text
    • http://files.nauvoowinery.com/uploads/1/3/0/7/130739182/5953352bd21f8.pdfIn PDF document text
    • http://files.faithhometeam.com/uploads/1/3/0/8/130815026/riwadotelodebijude.pdfIn PDF document text
    • http://wopedi.stellabread.com/uploads/1/3/1/3/131398440/725b56c9.pdfIn PDF document text
    • http://files.learningthefinnishway.com/uploads/1/3/0/8/130813645/ff621f4068c7b9.pdfIn PDF document text
    • http://files.avianaonline.com/uploads/1/3/0/7/130739764/2548249.pdfIn PDF document text
    • http://files.kahatahi.com/uploads/1/3/1/0/131070765/polokenebadozes.pdfIn PDF document text
    • http://vozenu.barkingdogmedia.co.uk/uploads/1/3/2/6/132682565/10b0dab.pdfIn PDF document text
    • http://tananu.campbornthisway.org/uploads/1/3/0/7/130740434/figux-fafirudize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDE 4936 bytes
SHA-256: b80dc348a883e940be61220828765e6ca198cd37eb0082395bbc7b1a0233cff9
font_01_sfnt_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 14980 bytes
SHA-256: 0e653e2e6f9515190f8030240550ddaa3101f57a99822a63fe9e9ce5da2d456b

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