Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af0fec2816c9898…

MALICIOUS

PDF

42.0 KB Created: 2020-11-04 09:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-06
MD5: d4550ba14606c035eac42c13b5f96bfc SHA-1: c4e92ecda3e187bbde6b43b5a719865013cb6b8a SHA-256: 4af0fec2816c989816db08d33fa966a79cdc464fbfca74b48bbd8ce12c9502dd
194 Risk Score

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.
  • 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=heat+of+fusion+lab+answers+hypothesis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f8e1e6f7a5f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5f92fcfdab2d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_5f8f6448d8b95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5f8b11587f50a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_5f9a4389a96fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388052/normal_5f98c873889db.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/folutudipafej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_5f9fbf9d47bd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5f977f6f97fe2.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/teximikamukubo/93756740172.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/everfi_answers_payment_types.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/pilates_exercises_for_back_pain.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/sieve_analysis_test_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/catcher_in_the_rye_test_answers.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_off000061d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D2 5284 bytes
SHA-256: 0265d21b7e0ad0141106a349a58afb4aeb478fbb9fc9843d93f3090c0a0c0b42
font_01_sfnt_off000073da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73DA 11048 bytes
SHA-256: d5014f03e8c8082a822a68b074ee48fbd153aae8024c4cfac177ee8207242c22