Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e2b54da4183e94…

MALICIOUS

PDF

70.4 KB Created: 2020-08-08 16:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 621f12a92e6abffd2c2cdbd91680a72e SHA-1: 335d3fca11d154cb2711ae9a8cad19472a50f376 SHA-256: 18e2b54da4183e9472deca85c2e85da847b1bd76b7e15671f69801911b551513
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service (ttraff.com) that is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'accounting equation questions' and a URL that appears to be part of a link farm designed to improve search engine ranking for malicious content. The ML classifier also strongly indicated maliciousness.

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=accounting+equation+questions+and+answers+pdf+class+11 In PDF document text
    • http://files.thepartitionarchives.com/uploads/1/3/2/6/132696598/6533251.pdfIn PDF document text
    • http://xiboxuki.birthingdivine.com/uploads/1/3/1/3/131383544/nurak.pdfIn PDF document text
    • http://files.flyawaykate.com/uploads/1/3/0/8/130874317/4534322.pdfIn PDF document text
    • http://files.cismaths.co.uk/uploads/1/3/2/8/132814929/zijiru.pdfIn PDF document text
    • http://files.polarstaryouth.com/uploads/1/3/1/3/131378776/8914340.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/1/0429/2499/8819/files/pdf_reader_kindle_alternative.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/71395214239.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/13777942259.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/leragogipaniv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/30614063718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/36954842988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/6029160314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1423/2984/files/diweluw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8918/3398/files/47603719125.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55D 5584 bytes
SHA-256: 087481057ecadf58ebc73d67632ddb81c67529406c22240725265191ff55e710
font_01_sfnt_off0000c87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 14884 bytes
SHA-256: 0bdee5cf8e884835520be134306ff3394604ff2bd7d9c408b33d878f9ad6818f
font_02_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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