Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7ecad151522adf…

MALICIOUS

PDF

36.7 KB Created: 2020-08-12 18:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 73b5e4415dc9795cb337fbd13ad27002 SHA-1: 6b3c7bc3e62611d7dd46ca8996929d150b995ec0 SHA-256: ff7ecad151522adfeabd1b893cafe05bee90cab4e489fca46c86240fab046c6a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.com/wb?keyword=factorising%20into%20double%20brackets%20worksheet%20tes', is designed to redirect users to malicious infrastructure. The document also contains a large number of external links, many hosted on Shopify, suggesting a link farm for SEO poisoning or to obscure the ultimate destination.

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/wb?keyword=factorising%20into%20double%20brackets%20worksheet%20tes In PDF document text
    • http://files.plazacateringboston.com/uploads/1/3/0/9/130969209/toditujuxog.pdfIn PDF document text
    • http://files.unboundtravelers.org/uploads/1/3/0/8/130874489/tagiredo.pdfIn PDF document text
    • http://files.artworksnepa.com/uploads/1/3/0/8/130814127/9430792.pdfIn PDF document text
    • http://files.jylynch.ca/uploads/1/3/1/0/131070702/fc5d85e2f053.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/1/0434/4581/3413/files/3493793224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/98221454913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/tokasamudowojuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/zunajaraxilafufagok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6036/2392/files/puzagefozerufigexorizuka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5880/7455/files/ximinakamom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/iron_gym_workout_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7685/9557/files/english_sentences_with_tamil_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/1881436892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6884/0341/files/51634083753.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_off000050b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50B5 5452 bytes
SHA-256: 9b38b3e1e18c3d5b50b93e5b98028f3c582e4f31887776f9d9d9f775f487abb7
font_01_sfnt_off00006346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6346 10052 bytes
SHA-256: f099d2750be7b201470ee071f22ea4e03f9ced941382e38308682eb133b8e317

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