Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a1fced1c506943…

MALICIOUS

PDF

43.6 KB Created: 2020-08-04 05:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ef5f0b21c03ce785626185ebd5b9ab2a SHA-1: f7f43e7e908f94db07bf31914bc90bac8828e7a2 SHA-256: 86a1fced1c50694301e7147e0e68990cdebed4722de473e34ee7cf2c81ab59aa
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) that is known to host malicious content. The document body, though obfuscated, contains text related to a book title and URLs that appear to be part of an SEO link farm designed to trick users into downloading further malicious PDFs. 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=marriott+s+practical+electrocardiography+13th+edition+pdf In PDF document text
    • http://files.justforyouspa.com/uploads/1/3/0/7/130740323/e5ea9d460d.pdfIn PDF document text
    • http://files.theultimatecruiser.com/uploads/1/3/1/4/131437362/1045534.pdfIn PDF document text
    • http://files.ahorsestoryallaboutpieanoldbrownhorse.com/uploads/1/3/0/7/130740242/tojid.pdfIn PDF document text
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.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/1/0431/7659/1509/files/tofolag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0797/5317/files/82702767279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4570/7166/files/81718899245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7729/5516/files/nawupir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/94275574761.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96626323422.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3646/7612/files/buvojuloluvapubedopimiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8612/4958/files/zaniworimegozarezoxemaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/23499543815.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/38040493895.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/27934299260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4174/3263/files/moginefizuzedu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/36223970368.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/kofapasabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/pokemon_emerald_guide_book.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_off00006b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B01 5740 bytes
SHA-256: 3ea205764db5cd8b1ed2353ffab5efc7ac4bef509fa83678f4bb5e5c70ee8510
font_01_sfnt_off00007ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA3 10120 bytes
SHA-256: 87bc89c35021ae8d6c732ad7d92d43ede6b8b515296e4757aa4ea537a8c28f13

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