Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e61ec61393a60a…

MALICIOUS

PDF

44.3 KB Created: 2020-08-15 02:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7f2995f6ff45a2d5be8a5d94cf3e50d5 SHA-1: f44a0d64f1b8f2132447e8ebb4d7d876a9ccb115 SHA-256: 81e61ec61393a60a1da2e9fb04d13735aa409e2c994eba77d603a10fb1f59453
194 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to a redirector service at ttraff.ru. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that these links are part of a link farm designed to phish users under the guise of offering free downloads. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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=2019+calendar+template+week+starting+monday In PDF document text
    • http://kegusare.flotography.org/uploads/1/3/1/3/131383483/5da3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/41450829189.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4088/2340/files/modern_physics_randy_harris.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6078/9409/files/30285491449.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7168/4252/files/sedobakawuvubipezaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/katepilodezoxenurivelolaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4498/6262/files/factorio_color_command.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6462/2242/files/97667267862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/rezab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/xivavipofititux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/7851154578.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2175/2731/files/22470645162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2442/4870/files/bedutavekibok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB3 5824 bytes
SHA-256: b7e7920fadba5680ed3083284f26e0f0b20ffd33bbc557e3904bee728908f30a
font_01_sfnt_off00007179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7179 10772 bytes
SHA-256: 8513e5f1b6e294683bca149062691f7a7f7acc45e37a026564f7ffa5befd8786
font_02_sfnt_off00009610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9610 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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