Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d91ddcc5ef590c…

MALICIOUS

PDF

43.0 KB Created: 2020-08-19 18:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: de41afd63c3b58ce37991be59a17c27a SHA-1: bc7ea992db0a835fb2fdd729b3348f4ea625be40 SHA-256: 64d91ddcc5ef590c1806bd72e966df41383329a0453e0e8a4f8350fb56651be7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to a redirector service (ttraff.com) which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'differential calculus' and URLs that appear to be part of a link farm designed to attract users searching for educational materials. This suggests a phishing or scam attempt using a lure of free educational content to redirect users to malicious infrastructure.

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.com/pify?keyword=differential+calculus+pdf+ncert In PDF document text
    • http://bujusu.altapacificmortgages.com/uploads/1/3/1/8/131857144/2689626daf37.pdfIn PDF document text
    • http://files.1nelson.ca/uploads/1/3/1/0/131070207/6957002.pdfIn PDF document text
    • http://files.brandonroberteck.com/uploads/1/3/1/8/131856917/8d3d29532243c.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/1/0434/1612/5590/files/vevirusonabovubud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8325/9301/files/manexerixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/dictionary_in_swift.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1905/0908/files/14339356382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/pais_ausentes_filhos_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lezoxaxus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4188/0224/files/60436072038.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1791/8875/files/economia_capitalista_e_socialista.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/79101952608.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 4

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_off00006231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 5148 bytes
SHA-256: ac5d63ce10cffe34dc7db16059c01905ca6a1b2ac8872b04af0001573abc85a5
font_01_sfnt_off000073c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C3 13684 bytes
SHA-256: 5106cf9f72a643625f9cdd50b220d9b2da584f2e8ae5288f1f084229a7eb6cb6

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