Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4399ccfe9dd57e…

MALICIOUS

PDF

40.7 KB Created: 2020-08-08 12:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 36d6bac889930f724e0e51399f06ebe1 SHA-1: 02ec81a0140ac410ba47091a5c3c8d6845defe1f SHA-256: 0c4399ccfe9dd57ee00e657886a2e35f3afae59d60fe9bc4fb1958ec5965fad2
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, masquerading as a free calculus textbook download. The primary redirector URL, https://ttraff.ru/pify?keyword=the+abc+s+of+calculus+volume+1+pdf, is flagged as malicious and part of a link farm, indicating a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to a malicious site.

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=the+abc+s+of+calculus+volume+1+pdf In PDF document text
    • http://files.jillwongphotography.com/uploads/1/3/0/9/130969695/1db84d8f4.pdfIn PDF document text
    • http://files.greentechcostarica.com/uploads/1/3/0/7/130738892/1081458.pdfIn PDF document text
    • http://files.hisinscriptions.com/uploads/1/3/0/7/130740066/ca085ca6.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/1/0434/5082/6919/files/lavikexuxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/94288219793.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1865/7697/files/buzukemupopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0235/6124/files/58939018338.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/74398225796.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/59737558989.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/8384880295.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muxolalinurijelibabozafod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/file_clerk_job_description.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4836/1375/files/14332110144.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/19194400857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/duzixebepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9153/2699/files/74941060860.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_off00005dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEE 5500 bytes
SHA-256: 46fb937dfd1c29ce146beaa26fa16a4f0ffec02cbe56e6d29c2c4004bcdfabf6
font_01_sfnt_off00007087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7087 11120 bytes
SHA-256: d3c1a6b1a95a5817fa21bd41d6404467bae19c191fdf7a53ff0f60ee1bacbede

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