Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4bb3f71170d607…

MALICIOUS

PDF

43.8 KB Created: 2020-08-12 05:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3eb38eed5ae8428b69d6da5b7beddb4f SHA-1: 5d4ba616fb4bf7e1286b8b35e477ef9b4589ef09 SHA-256: 3f4bb3f71170d60751a43b2cba3be1612be89a24782f023f4303cd8f6a573bdb
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO abuse. One critical heuristic identified a link to a known malicious redirector at ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to disguise the malicious intent.

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=year%203%20maths%20subtraction%20worksheets In PDF document text
    • http://files.ashleycarruthers.com/uploads/1/3/2/7/132710621/gopis.pdfIn PDF document text
    • http://files.tomjohnsongolf.com/uploads/1/3/2/7/132741110/bc51c15d667bf33.pdfIn PDF document text
    • http://files.newjerseywritingalliance.org/uploads/1/3/1/0/131070841/4540fe0f.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/1/0431/4542/9160/files/3084605657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/2920770225.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8745/2576/files/jajem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/7975/7977/files/graveyard_keeper_hops_seeds.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/lonely_planet_cuba_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/jirow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/rujuramofit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/graphic_design_skills.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 5

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_off00006e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E07 5428 bytes
SHA-256: caeafc8c6cf516f1e6031f39de659b3d508643c63d4e41f1cad6fcca463cf872
font_01_sfnt_off0000806a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806A 10020 bytes
SHA-256: 27f627f98177cd4a9a5d23ad3855b8cfaee142806904f687ea8c680fc19b2730

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