Malicious PDF — malware analysis report

Static analysis result for SHA-256 85af9f3760647c50…

MALICIOUS

PDF

44.4 KB Created: 2020-08-19 18:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 9493990a7475da6daa418d381d2596c7 SHA-1: 391686f6fd8c7d5cf74c29773e2ece362c591d07 SHA-256: 85af9f3760647c50820caf2aa069eb32c72424e82375be4c5acb4fbe33c28804
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 heavily obfuscated, contains the same redirector URL and appears to be a lure for free downloads, aligning with phishing or malware distribution tactics. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a 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/pify?keyword=chakra+healing+sleep+guided+meditation In PDF document text
    • http://files.victoryframe.com/uploads/1/3/0/8/130873851/5825974.pdfIn PDF document text
    • http://misefiz.cambridgeintlschool.com/uploads/1/3/1/3/131383541/bced432f6.pdfIn PDF document text
    • http://files.licmotorsports.com/uploads/1/3/0/9/130969452/414201.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/1/0434/9755/4084/files/19389742857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/magokegug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7053/6345/files/xetilikijilako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/66082961211.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/nekaxefugafosibijes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9145/1294/files/79547595546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/free_technical_drawing_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3979/3050/files/saxusativi.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_off00006f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F49 5340 bytes
SHA-256: 2ac8cc5ba23d19b6c8a09747a217f2fc803ed91c72098f868bbc944d6c173df8
font_01_sfnt_off00008144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8144 10496 bytes
SHA-256: fd6351d94c3a9b482e99541b57f6c59d9aa3dd8bd7ffbe924947e240805b2a70

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