Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b2e4e75be76b0a…

MALICIOUS

PDF

36.5 KB Created: 2020-08-04 11:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f8308568b6cd434fadf882e0357d8bca SHA-1: 506b1776c8a67efd8e96ca0bda4c4104287cc4a8 SHA-256: 66b2e4e75be76b0a92451d6ee72c99884b968c7d1d613e15ed2efb6527809a68
194 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as legitimate exam papers, but they redirect to a link farm hosted on ttraff.com, which is flagged as malicious. This suggests a phishing or malware distribution scheme. The embedded document body text, though partially corrupted, contains keywords related to exam papers and the redirector URL, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=cambridge+o+level+english+language+past+exam+papers+pdf In PDF document text
    • http://files.drogmi.org/uploads/1/3/0/8/130813667/1211782.pdfIn PDF document text
    • http://files.gjohnstone.net/uploads/1/3/1/6/131637043/6103523.pdfIn PDF document text
    • http://files.my-early-morning-thoughts.com/uploads/1/3/1/6/131606109/1ab6aacc70de7ce.pdfIn PDF document text
    • http://files.daviestreeservicesltd.co.uk/uploads/1/3/0/8/130814280/kamipabotu.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/1/0431/1026/9085/files/titel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/50250792776.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3183/8368/files/warcraft_the_roleplaying_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5282/6773/files/60870755673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4256/0407/files/33814553940.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/aliens_colonial_marines_technical_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4169/2567/files/80786492369.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/87769351191.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_off00004e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5B 5628 bytes
SHA-256: dcd82f531a6ef3f647f4bb11545876c0daf1dc3f6a9003c7bcc3ba8426360fa9
font_01_sfnt_off00006153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6153 10436 bytes
SHA-256: a1fc51118ce327655fcda74ee9397e55c79f870854edb59640fa2e0e36be9181

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