Malicious PDF — malware analysis report

Static analysis result for SHA-256 818d6df9df22d6b5…

MALICIOUS

PDF

49.3 KB Created: 2020-07-29 01:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 976c465ec69f535559725f41e70b4cd3 SHA-1: c04d4b5b1c44fd6c41fd3cd98e0e4f897f7b000d SHA-256: 818d6df9df22d6b5f7bbcc3d5ed6ae062ebcbf1e17e22be282391e8722385dfe
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting an attempt to drive traffic to malicious infrastructure. The embedded URL and the document body's deceptive title 'Official business letterhead format' point towards a phishing or scam lure. 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=official+business+letterhead+format In PDF document text
    • http://files.malamathesea.com/uploads/1/3/1/1/131163590/vunuro.pdfIn PDF document text
    • http://files.playfullpotential.com/uploads/1/3/1/6/131607374/lomov-tuliz.pdfIn PDF document text
    • http://files.ehabacademy.com/uploads/1/3/1/8/131871704/01146ea.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/1/0431/0240/4769/files/65279780346.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/73433344157.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2801/3471/files/dajiludirelogepewe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/vekalunifevagen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8444/5864/files/dogavodut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/91927193273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2499/0887/files/tadawajab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8824/6936/files/nomawefisogiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/kosidudoturetiliturolawaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5567/6580/files/46815472936.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/nixoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/vekonawebigivafanixam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8846/2495/files/tovodilaja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4492/1766/files/5473706622.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_off000083b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B8 5308 bytes
SHA-256: a09288c295e2c86095dfd5bee2cc6874ca8015243e62cad1785e20a491d488cb
font_01_sfnt_off0000958a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x958A 10092 bytes
SHA-256: 5028bec38ce31aa2d0bb2a35835d5763a32472c7b10cfd194b8cb1b883761698

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