Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c37add9a210c90b…

MALICIOUS

PDF

31.6 KB Created: 2020-11-09 14:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ebe36300fde83297164b165d6ed853d7 SHA-1: 925d4f38492a685489023301f466cb9b88423253 SHA-256: 5c37add9a210c90beaefea41436c2af0addb5d3115405cbba55592668030f45e
76 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is malicious and uses a redirector link. The embedded URL, 'https://trafftec.ru/123?keyword=pollution+worksheet+kindergarten', is presented as a 'pollution worksheet kindergarten' and is flagged as a lure for free-download phishing. Although no scripts were explicitly extracted, the PDF structure and the ML classifier strongly suggest malicious intent, likely to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?keyword=pollution+worksheet+kindergarten PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f8d44d7cdc6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_5f98384197c18.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/rasegawi/52901981264.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/star_wars_essential_guide_to_warfare_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d36d50e-a2be-44b0-a06b-598ede2ade48/galataport_projesi_mimar.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/esempi_di_metafora.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/16373202826.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/rankine_cycle_examples_and_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/english_active_and_passive_voice_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/614_area_code_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/riddick_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/analyze_this_script.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_off00004285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4285 5244 bytes
SHA-256: 393ae1b3598d630d43167561a1503fd8a133f9fc2fb6c73241e42334ebe2059f
font_01_sfnt_off00005462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5462 8644 bytes
SHA-256: 696154f4ded291136d4b18ab753c57277be3b957c243d2c2ddd43e9c693ec8aa

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