Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a75a5915b79f766…

MALICIOUS

PDF

50.7 KB Created: 2020-08-08 15:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cf371d8c781af003ead7a60b3a047113 SHA-1: e3791943eeb616a675df085da2e7d9707c8f7981 SHA-256: 3a75a5915b79f7669fec8271fe0ec79fe48afe7ac736959ad9a7bc3809221464
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, many of which are hosted on Shopify and appear to be part of an SEO link farm. The primary malicious link, https://ttraff.ru/pify?keyword=a+ladder+to_the_sky_john_boyne_pdf, is identified as a redirector to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL.

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=a+ladder+to+the+sky+john+boyne+pdf In PDF document text
    • http://files.nycridingacademy.org/uploads/1/3/1/3/131381352/353600359c5d26.pdfIn PDF document text
    • http://files.kreativekael.com/uploads/1/3/0/8/130813747/e7507.pdfIn PDF document text
    • http://files.tidytimeservices.com/uploads/1/3/0/8/130874522/jijojebobazejij.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/1/0432/8236/6624/files/54146831345.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5992/9503/files/parvana_full_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/kopopoxuboxaverefojajupuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/59807470043.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2539/8945/files/jerixanajimopupisafinunux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/technical_interview_questions_on_java_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2821/5968/files/neet_biology_practice_papers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/use_boxmen_level_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/20441359622.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8461/9681/files/xipazotogopefusokig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5671/7205/files/learn_french_language.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/7093209195.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_off00008680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8680 5500 bytes
SHA-256: 5c58bb59b02b9f5a871e7f0e7332df3429ad1f73f529280862e8f5b855bded11
font_01_sfnt_off00009934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9934 10652 bytes
SHA-256: fa3690833a49683494db50acf6b4bcf928bcc777d74fc11c4be5d524203fdacb

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