Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b79bbae33acfd3…

MALICIOUS

PDF

42.3 KB Created: 2020-08-09 01:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b21dc9109ea498873d2730e8796958af SHA-1: 754bf232cfd243680e101291e9ce8576b6f4f8ff SHA-256: 27b79bbae33acfd3cfe72d8b5dbefc2e944ba0c94a442b68c740fd7d2d75a471
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document exhibits characteristics of a link farm, embedding numerous external links. A critical heuristic identified a link to a known malicious redirector service, https://ttraff.ru/pify?keyword=antibiotic+spectrum+of+activity+pdf, suggesting an attempt to obscure the ultimate malicious destination. The ML classifier strongly supports the malicious verdict.

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=antibiotic+spectrum+of+activity+pdf In PDF document text
    • http://files.starwarsjournal.com/uploads/1/3/1/8/131856705/d4ecace2.pdfIn PDF document text
    • http://files.smithcustomdesigns.com/uploads/1/3/1/3/131378918/7139561.pdfIn PDF document text
    • http://livig.adclife.com/uploads/1/3/1/4/131438641/4188751.pdfIn PDF document text
    • http://files.youthactionmemphis.com/uploads/1/3/1/0/131070178/41ccea.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/1/0433/7487/0689/files/free_bicycle_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/encyclopaedia_of_islam_2nd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mojedisubeweful.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/angular_js_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/bike_parts_name_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/fejowolewuvefepegajezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/78583699802.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5491/3943/files/75258155044.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9712/9109/files/dubeporarizixigeleg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/mockingbird_walter_tevis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/51121634512.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8435/6507/files/rasudufojo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/pezowavufalodajajelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1644/4315/files/65500555288.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_off0000677e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x677E 5560 bytes
SHA-256: 227bef2646a2da904ac88cdd08cedb516bbcf9224bebf4d6b29c183565598d02
font_01_sfnt_off00007a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5E 9888 bytes
SHA-256: d02ee7964f845971497b4cde28918d65e9de062b914329bb27254f08f9b24cbd

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