Malicious PDF — malware analysis report

Static analysis result for SHA-256 33495856c2c82a65…

MALICIOUS

PDF

34.1 KB Created: 2020-11-02 06:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cf843eed3a2f11ae79a165950f375cfb SHA-1: d1750e07559c5e08c19f23540d9e4422375caac7 SHA-256: 33495856c2c82a65fed2225ed6bbe754c509f2b865fa87fce6ccf6289ac07970
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, creating a link farm. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=buddha+board+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f8761113ea4b.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/jagagifudeju.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/2631284.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/gedimuta/85843034697.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/allen_jee_advanced_test_papers.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/descargar_libro_after_2_espaol_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1143/9259/files/the_immune_system_webquest_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df951a8-cf6a-4f60-b5ca-79cf6a5056e1/kofurokaforofekinixeta.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/abortion_law_in_nepal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1cef97-55ed-471a-87e1-0c0478e1d12d/kuxefevejimotasol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2290877f-f887-4405-887a-b348fd30cbb8/49747135285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0545/8624/files/nyc_doe_teachers_choice_2019-2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa1b870-53cd-4d13-96cf-5a732cdcf920/karika.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/301_smart_answers_to_tough_interview_questions_download.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_off000048bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48BC 5028 bytes
SHA-256: d1cdd2d2623b9a572a6ad3eb673cdade1966abc2aa02eb47d4dafdec70e2b365
font_01_sfnt_off000059c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59C5 10088 bytes
SHA-256: 4e252254172efe04077bc29c484c3590defd772d979c3dd3bb92d9a422dd906f

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