Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bcfe372fd93bd3…

MALICIOUS

PDF

41.9 KB Created: 2020-08-17 16:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7bb52975073b1366b9f9d2a7c0dfa89d SHA-1: 5e176ef2691913063388db1e51a8d84b92d9dd63 SHA-256: b4bcfe372fd93bd3317608e412c3dc98bcc331b0d6a25e8f1d0f1b02985c3a98
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was generated by wkhtmltopdf and contains a significant number of embedded links to external PDF files, many hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=keloid+formation+helix+piercing', is flagged as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign documents.

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://ttraff.ru/pify?keyword=keloid+formation+helix+piercing In PDF document text
    • http://vimikog.college-elf.com/uploads/1/3/1/4/131406676/7459252.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9671/0047/files/gone_elevation_worship_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/32705627487.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/suliloboguvijuxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/bovabed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7180/7381/files/modern_trends_in_educational_management.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0075/7398/files/dc_motor_armature_reaction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/33763611218.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/pink_floyd_moonhead.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4396/3555/files/95251762334.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0600/0282/files/roadside_design_guide_4th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98048873934.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/6536102644.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/bezoletudaxofurodikaku.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

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AC 5428 bytes
SHA-256: abfcf104c77a0d57cfe4deccfdce0e10e6c5172c79e9895bffdae5eaeb7ccddf
font_01_sfnt_off000078f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78F5 10036 bytes
SHA-256: 1a35011892d8fb6a69a0469164681ba2ec389099b802215bc985689290550b6c

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