Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d81fc9cfd7fe199…

MALICIOUS

PDF

49.2 KB Created: 2020-10-26 23:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-18
MD5: 6ead1716cfe449c33655a69cc285c571 SHA-1: 318fb03f9dbef69de1c0cdc9710f43c47de0789f SHA-256: 5d81fc9cfd7fe19983bb3dba3ee20a8c011f7e500d23c6df48629657194488ae
134 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=dinamicas+para+ni%25C3%25B1os+de+primaria In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5f88c487a2852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_5f96b551b8786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5f913d8101810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_5f93530283fe6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zirojopemup/dubusanipipoxigegojigol.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/wejatab.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/exercicios_absolutismo_e_mercantilismo.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/aviation_safety_standards.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/15840087696.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/75738086960.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/femewanuzudumoveta.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/basic_civil_engineering_books_in_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f93cf8-a171-462f-ad30-70940f6cd319/luxugofetarixepezomezaped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3268cd-9975-4484-8faa-6a3e1cf9ef81/54924180113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c65d83e-d6c1-4f8d-b647-a95a0c1e6b33/78568204456.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/44929832222.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/learning_how_to_learn_joseph_d_novak.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/present_simple_and_present_continuous_exercises_tests.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/fezunevenefi.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/10_class_math_ncert_solution_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71BF 5104 bytes
SHA-256: 9aee8e1e29b5ad9e701c76d17c584527a08f5f61bf77926101fd11e3da9adea9
font_01_sfnt_off000082a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A4 11804 bytes
SHA-256: 512bf243684f72d4f8c8b4deee847000f76a56a3c67921c9d3333bd1858cfcdd
font_02_sfnt_off0000a772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA772 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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