Malicious PDF — malware analysis report

Static analysis result for SHA-256 540bcd74f45ea6d3…

MALICIOUS

PDF

36.2 KB Created: 2020-08-14 18:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b1f291bcb02654e0da76b2dc611b17ae SHA-1: 30f8941c8a6a6ebd4f522e7ab1a97be4476c8b8e SHA-256: 540bcd74f45ea6d39bfadff918bbb226e8b76983a4207f6344134f88a132ae7c
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=aqa+gcse+biology+textbook. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. 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.ru/pify?keyword=aqa+gcse+biology+textbook In PDF document text
    • http://files.tdpbooks.com/uploads/1/3/0/8/130814715/72ed8d6.pdfIn PDF document text
    • http://files.shawncorneliusentertainment.com/uploads/1/3/2/7/132740804/189cb.pdfIn PDF document text
    • http://files.dogbreedgifts.studio/uploads/1/3/2/7/132710491/86da115a.pdfIn PDF document text
    • http://vafeke.tonyzale.org/uploads/1/3/1/6/131606490/derapenupo-vamuk-kudijofoxowumup.pdfIn PDF document text
    • http://files.thecastlespa.co.uk/uploads/1/3/1/4/131407802/bositoliluw.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/1/0431/5434/2042/files/rune_factory_3_rom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/ulg_hdlg_dhi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4615/6960/files/tozivodipunogikuxadi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8724/0093/files/brachial_plexus_lesions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4950/0328/files/kazifizijodixofoduvedu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/65138748943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/pixobujaragudavozaroviko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/82824755297.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/bekube.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 7

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_off000049de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49DE 5360 bytes
SHA-256: 373bc8987f145282fd5149db194bcf3958d8f97564973d9735a21504c13d6e08
font_01_sfnt_off00005c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C32 12548 bytes
SHA-256: ac773a7abc43a31ca1582e811892b918ba2790d9f78a1502d754c94d69881cc0

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