Malicious PDF — malware analysis report

Static analysis result for SHA-256 34313a4d1d4d59d8…

MALICIOUS

PDF

41.1 KB Created: 2020-10-05 07:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 482e1b5e70987881b225fc36aa50dc14 SHA-1: 7743dde9d19b41c9cdcfda9acb1253fcec931207 SHA-256: 34313a4d1d4d59d88d6bdbb1ed09acbf8e9a74f5bdc8c454b109aa07cab3c401
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a known malicious redirector, suggesting the document's purpose is to lead the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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 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://cctraff.ru/strik?keyword=academic+stress+survey+questionnaire+pdf In PDF document text
    • https://site-1036885.mozfiles.com/files/1036885/85064023189.pdfIn PDF document text
    • https://site-1040182.mozfiles.com/files/1040182/turipa.pdfIn PDF document text
    • https://site-1037057.mozfiles.com/files/1037057/11293545206.pdfIn PDF document text
    • https://site-1043532.mozfiles.com/files/1043532/jaxufir.pdfIn PDF document text
    • http://files.christislifeministry.org/uploads/1/3/2/6/132681513/512708.pdfIn PDF document text
    • http://pikoles.yogasoleil.net/uploads/1/3/0/7/130775198/c53d6dc92b6d3.pdfIn PDF document text
    • http://files.limitlessyourlife.com/uploads/1/3/1/3/131384663/taxuno.pdfIn PDF document text
    • http://files.bittersweetconfections.com/uploads/1/3/1/4/131437823/kenusoninunuzukeluba.pdfIn PDF document text
    • https://site-1040008.mozfiles.com/files/1040008/jinukixodimo.pdfIn PDF document text
    • https://site-1043153.mozfiles.com/files/1043153/xabudevezejenaxa.pdfIn PDF document text
    • https://site-1040005.mozfiles.com/files/1040005/bolufikisekama.pdfIn PDF document text
    • https://site-1036742.mozfiles.com/files/1036742/11965848676.pdfIn PDF document text
    • https://site-1039720.mozfiles.com/files/1039720/rubiwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae497d7-e06f-4ef2-9e8b-bf76814672d0/joxopobel.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_off0000609f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609F 5544 bytes
SHA-256: c098fd1d2c7d80819548339367e1fb53a05002b85a2733a9998cd3ebbfdb968e
font_01_sfnt_off00007378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7378 10672 bytes
SHA-256: 775920a673c02675908f75716a42f85e39f08a27e4d1970e935f8b0b908a7335

Open this report in the interactive analyzer, or submit your own file for analysis.