Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a1bb745c7f662c…

MALICIOUS

PDF

36.9 KB Created: 2020-08-06 07:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e4d73b596da6de3e7c9deff430fc8716 SHA-1: 86807dca2e30dc4ae28a2bf5756e1a5d3ee567ca SHA-256: d4a1bb745c7f662c722471c7f355ff1d2d6047042a7a6d8a9e1cd663dae7fd27
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector at 'https://ttraff.ru/pify?keyword=9th+class+result+2020+karachi+board+science+group+pdf'. This suggests the document is designed to lure users to malicious infrastructure under the guise of providing academic results. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=9th+class+result+2020+karachi+board+science+group+pdf In PDF document text
    • http://files.econatura.com/uploads/1/3/0/8/130874254/1241342.pdfIn PDF document text
    • http://files.medfieldheightspto.com/uploads/1/3/1/0/131070190/joridesaz.pdfIn PDF document text
    • http://files.alexsarkisian.com/uploads/1/3/2/6/132680994/71905.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/1/0428/1355/4855/files/bukanenuvezegajus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7955/7529/files/5154541325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8844/5591/files/4890484546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/menanapalirufefazalul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/notadenagefajofakiwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/south-_western_federal_taxation_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/maxun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3980/8922/files/83175139869.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/fazodogavijovanawawem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/55284534671.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_off000050b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50B9 5956 bytes
SHA-256: 7ca58d0d4ac8670ccc52c65ef5895488028976728a6efee01d48853f7899de4d
font_01_sfnt_off000064e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 9836 bytes
SHA-256: 5c20e454a3b28281ad356de7d217db99c8c2cf0be68aa9d9a028fad6e6c8ef17

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