Malicious PDF — malware analysis report

Static analysis result for SHA-256 4731729e27371ac6…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 01:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9e37117faf5053a4f8d7784e74c206fe SHA-1: b4921497fc873bb783ab51a5149b9e0c024b66aa SHA-256: 4731729e27371ac6b953e1150f1da580504f6b9b7fc25ca507975d7f9d33284f
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 of which point to a link farm designed to improve search engine rankings. One prominent link redirects to a known malicious infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to a 'diploma in public administration course outline', suggesting a lure to entice users to click the malicious link. The ML classifier also strongly indicated maliciousness.

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=diploma+in+public+administration+course+outline+pdf In PDF document text
    • http://files.barnsandburleycandleco.com/uploads/1/3/0/8/130813528/ruzaf.pdfIn PDF document text
    • http://files.portagecrossfitcooperative.com/uploads/1/3/1/4/131406288/000495ed1.pdfIn PDF document text
    • http://files.fccwareham.org/uploads/1/3/2/7/132740860/4414195.pdfIn PDF document text
    • http://files.centralladycatsoccer.com/uploads/1/3/1/4/131437680/lijexurojadebesires.pdfIn PDF document text
    • http://kofaxaw.lovelashed.com/uploads/1/3/0/7/130776485/9092770.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/1/0429/6926/8373/files/87377889319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4167/6694/files/research_paper_on_agricultural_marketing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6089/4627/files/puwakabazejitupis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/2699/2551/files/pdf_smaller_size_converter_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/dewubixotetufox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/gijuguwarugawos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4443/7144/files/lunavitovijivevipadowo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88406012193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/bacilos_gram_negativos_aerobios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/como_fazer_referencia_bibliografica_de_arquivo_em_abnt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9823/4270/files/ajp_taylor_war_by_timetable.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 8

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_off000066b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B3 5440 bytes
SHA-256: 8c9b6887e2df39074d3b47db6aa1c27a9460c3fcb5559245122de60d81ed7aae
font_01_sfnt_off00007909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7909 10440 bytes
SHA-256: 8b9851939eac0ee21ce8d5c41cfb0b276c0efbd65189fcb1e3cd4cb23589baef

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