Malicious PDF — malware analysis report

Static analysis result for SHA-256 25638bffb8ebdc39…

MALICIOUS

PDF

37.4 KB Created: 2020-08-08 21:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 76e2be03988c7e3de2bd617264a57901 SHA-1: 8096e21cc18c2e380034446b34d1a7eb08bf40c4 SHA-256: 25638bffb8ebdc39dd651e930854a353201d09b5b1db895a898191e7c6216e14
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=advanced+engineering+maths+ka+stroud+pdf', is designed to redirect users to potentially harmful content. The document also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to benign Shopify domains but are likely used to obscure the malicious redirector.

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.cc/pify?keyword=advanced+engineering+maths+ka+stroud+pdf In PDF document text
    • http://files.plympton-wyomingfair.com/uploads/1/3/0/7/130739061/5a5a2.pdfIn PDF document text
    • http://files.take2actorsstudio.com/uploads/1/3/0/8/130814032/f2b1966273.pdfIn PDF document text
    • http://files.handmadehill.com/uploads/1/3/1/4/131411688/2034739.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/1/0434/0737/6546/files/california_secretary_of_state_entity_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/gadawaxaxujizasuma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/72243737082.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/wivep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/gizapobalasulilal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/el_alferez_real_eustaquio_palacios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5881/3336/files/tidusajizaronupadejam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0062/6341/files/14706181871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6905/4886/files/jijejaniwupiloxazov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/7863318679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/13933350724.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 3

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_off00005174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5174 5652 bytes
SHA-256: b6e0e2b2ce3a0d0061601a2e962e241da747039e004faa2944f32e9f15a795c6
font_01_sfnt_off00006493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6493 10144 bytes
SHA-256: 05123fa5770e3532468e63862a4f6ce3c05ce36becbc4e687837f187753178ca

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