Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f2540a38f3aef8…

MALICIOUS

PDF

52.3 KB Created: 2020-11-07 09:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-07-08
MD5: c61f37e53d8ac28bd1ed534a8498f620 SHA-1: 5d88907a263cb6e4f506155ab7f1229787537b1e SHA-256: 98f2540a38f3aef888aa54c9fbc2486fa8901a43837f3f3569b0d1b42ba48e8b
161 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF advertises pirated movie streaming/download medium PDF_PIRACY_STREAMING_LURE
    PDF rendered text advertises free full-movie streaming or download using piracy-brand names or a 'full movie + download/free/watch' intent phrase — recovered after folding the styled Unicode confusables the campaign uses to hide those keywords from plain-text detection. These are disposable SEO-spam carriers that route users to malvertising, fake-player, and scam pages; the PDF itself is inert.
  • 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://trafffe.ru/wb?keyword=50%20shades%20of%20freed%20free%20online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f9d783567448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f89faad5490a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5f99b1c08d619.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_01_sfnt_off000073b7.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_01_sfnt_off000073b7.bin)
    • https://uploads.strikinglycdn.com/files/949cbc58-514d-4339-8f7f-3e608b4caafa/subjunctive_spanish_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e876f1-52f0-442d-a6a2-2f87f4f521b4/fichas_vocales_minusculas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4458bf36-eed2-4e04-8af1-89a0bea600a4/gewum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7996821-7e56-42cd-8f34-f61d089c7675/robokojugevumuxunijapi.pdfIn PDF document text
    • https://davasowejize.files.wordpress.com/2020/11/kedalitananiwedawafona.pdfIn PDF document text
    • https://tosigipagop.files.wordpress.com/2020/11/american_english_file_2_workbook_second_edition.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 extracted file (font_01_sfnt_off000073b7.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_03_sfnt_off0000adc9.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_03_sfnt_off0000adc9.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6100 5444 bytes
SHA-256: 5733205ce03dbfb633c9b4696290bc8fb3eb398a46d772fa296c850e0c950a53
font_01_sfnt_off000073b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B7 5168 bytes
SHA-256: a2b4dccf4a56b2edb5fadc7bf3c6c57d2a60c8fef59dc87686907cd6bf96dd84
font_02_sfnt_off00008545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8545 12336 bytes
SHA-256: 26fe83643204ef04b5bbaf54be17bb6f668c86c58e186d85587c48064981406f
font_03_sfnt_off0000adc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC9 16064 bytes
SHA-256: c72b90224a3819ecb4df95d23212449dcf7016745c7ee066fd85b325348d32e1

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