Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bdfdcf8bd7af66…

MALICIOUS

PDF

33.0 KB Created: 2020-08-10 15:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 409a502fd6b98924cb33f9e184627409 SHA-1: 2d41689931b04b3c637fb623826532eed08ab15b SHA-256: 73bdfdcf8bd7af66037d0d87d3143bdf8108de71dd24c39bf67a079cb67f1c57
194 Risk Score

Malware Insights

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

This PDF document acts as a link farm, containing numerous links to external resources, many of which are hosted on Shopify. The primary malicious link, 'https://ttraff.ru/pify?keyword=ielts+writing+task+1+general+answer+sheet+pdf', is identified as a malicious redirector. The document's content and structure suggest a phishing or scam attempt, likely aiming to direct users to malicious websites under the guise of providing IELTS writing materials. 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=ielts+writing+task+1+general+answer+sheet+pdf In PDF document text
    • http://files.sopwhsv.org/uploads/1/3/1/3/131383826/685f3bd.pdfIn PDF document text
    • http://files.seiburyusanjose.com/uploads/1/3/0/7/130775180/1353430.pdfIn PDF document text
    • http://files.tri-waymold.com/uploads/1/3/0/8/130813108/nomefovilirutijegot.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/1/0431/0204/4316/files/zosiwekebulexixu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5106/5242/files/pofavutotoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3874/4469/files/benim_hocam_kpss_tarih_ders_notlar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/6351/4012/files/brokeback_mountain_text.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3275/5875/files/70278973877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/3_day_workout_routine_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/92823847656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/54724353643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6342/7751/files/noes_bsicas_de_administrao_pblica_para_concurso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/77942107652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/nunokip.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 3

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_off00004526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4526 5448 bytes
SHA-256: e7cf85d1a8d907f1acc15fd68c2a8d892e78f34bb7adfc560065fc1effb08e60
font_01_sfnt_off000057bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57BB 9148 bytes
SHA-256: 2909deded13a8b6d7967f96f46b0e79acf80f36e5e759d92a6727522a15000bf

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