Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda8b9b21b7ab907…

MALICIOUS

PDF

34.8 KB Created: 2020-08-14 21:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dc84bdd32f280089919ad642941f6484 SHA-1: 767a85b8468d11bd5ea7c86470da3ddbac976859 SHA-256: cda8b9b21b7ab907f1075ba69d28c0b349a968db94cd5723a6df7118308caf5e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text referencing a crossword puzzle and a URL that appears to be part of a lure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=craggy+hill+crossword+answer, which likely redirects to a further malicious payload. 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=craggy+hill+crossword+answer In PDF document text
    • http://tovuwajuf.elycehelford.com/uploads/1/3/2/6/132682467/5356096.pdfIn PDF document text
    • http://files.vealsphotography.com/uploads/1/3/1/3/131383953/fibogegiradat.pdfIn PDF document text
    • http://gezete.astrojournals.com/uploads/1/3/0/8/130814297/4692178.pdfIn PDF document text
    • http://files.expert-consultations.com/uploads/1/3/0/8/130815014/kujuwodusipiz.pdfIn PDF document text
    • http://files.t3chlan3.com/uploads/1/3/0/9/130969059/7253293.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/1/0429/8525/9159/files/lomamakejapiromubirebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/39428271307.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0250/1016/files/abscesos_cutaneos_tratamiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/john_deere_7510_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7921/2960/files/minecraft_wild_west.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/nidirejonefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/36971423372.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/6179018144.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 6

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_off00004aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAF 5300 bytes
SHA-256: 9f837d3aaf023d166175224af8ec82a614253a3364bcf6d67c520d1aa3d3d691
font_01_sfnt_off00005cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB6 9976 bytes
SHA-256: a4a69e2bebe04c1cc1ee09c0db9eda52f9ff51af7722f79a8c6956ab84d7ebcf

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