Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e38b5f0f8fb7d04…

MALICIOUS

PDF

39.6 KB Created: 2020-08-15 17:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4bc6ec9c469641033ab707045b01bf63 SHA-1: 3b19bfe090475cf11e2621f4a5a44be36eed0837 SHA-256: 5e38b5f0f8fb7d04ad992376e28d1a0a1b6363a9e6da5436c0d696caa880502e
194 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as legitimate downloads, but they redirect to a malicious SEO link farm. The primary redirector URL is https://ttraff.ru/wb?keyword=class%20c%20amplifier%20design%20pdf, which is known to host malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to disguise malicious links as document content.

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/wb?keyword=class%20c%20amplifier%20design%20pdf In PDF document text
    • http://kofifuzaz.mgr-design.com/uploads/1/3/1/8/131857631/4e08f3a05d.pdfIn PDF document text
    • http://files.complaintagainstprimera.com/uploads/1/3/1/6/131637054/8450891.pdfIn PDF document text
    • http://files.centerpointetherapistsllc.com/uploads/1/3/0/9/130969705/fagoburusamuw.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/1/0431/9569/5265/files/92912322845.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/xobopuxudibuxakiforubobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/15670119037.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4262/5953/files/blank_autopsy_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0583/6438/files/9737866585.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0052/9049/files/gaxefomufokat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/16995387890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/equifax_credit_report_free_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1370/9725/files/65047374984.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/82093130045.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5667/6510/files/pusekidapemubo.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 3

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_off00005db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB9 5380 bytes
SHA-256: d971402328a4aad66c045a3496d7893e7d0759e59d83dd1bfdffd6375211b55a
font_01_sfnt_off00006fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEC 9908 bytes
SHA-256: 82772091bb3957b01d010b4b72fab95c017ae261b1612546a69c683980bdbf7b

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