Malicious PDF — malware analysis report

Static analysis result for SHA-256 851094c05864322d…

MALICIOUS

PDF

45.3 KB Created: 2020-08-12 20:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c2b62e70ed6a3e358b41ceace09eedb8 SHA-1: 2ea1d52eacbd0a11c457d171af154fb43263b3ec SHA-256: 851094c05864322dc92a3aaa5329162064fe9123e58891b3b175990642ebdd55
194 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to redirector infrastructure, specifically identified as a "free-download phishing" lure. The primary redirector URL is https://ttraff.ru/pify?keyword=technical+letter+writing+pdf, which is designed to lead users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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=technical+letter+writing+pdf In PDF document text
    • http://vitin.theandywallace.com/uploads/1/3/1/0/131069934/99f4a559059.pdfIn PDF document text
    • http://wawuz.ultimatefantasyfighting.net/uploads/1/3/0/8/130813042/xododarejeg.pdfIn PDF document text
    • http://files.michelleblanchette.com/uploads/1/3/0/7/130775590/xepeva_gosaviditime_murazavepi.pdfIn PDF document text
    • http://files.heritageecc.com.au/uploads/1/3/0/7/130775432/b7a91b287662043.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/1/0434/0632/7957/files/10723236007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/90678893116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1714/1415/files/franchising_your_business.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/namibaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/zozaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4523/1515/files/48695723701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/26985954459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/52250469916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/buzor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5430/1338/files/kijuxavelovuxotos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/lejemiban.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/60475007728.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3653/2136/files/mofutubexodoseralawop.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 6

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_off00007221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7221 5280 bytes
SHA-256: d614ca03f680f6b8557d2ce027ce98f5034594c3295e1112f8a57e560d2762d6
font_01_sfnt_off00008419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8419 10648 bytes
SHA-256: 89eac6a6afbfe7f0bada1f843323c4f0f0d70c7d05e71d1c4a4e2b2732701ff8

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