Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf21e58fd1eff522…

MALICIOUS

PDF

39.8 KB Created: 2020-08-12 16:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9b5636cdf028c58d3b3f416972f2832f SHA-1: b8708466695456804b787504ffbd7a0bc74ee243 SHA-256: bf21e58fd1eff5225f4dce8a7276b0be86fb58a92403bcd934139956e6d54953
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and text related to ukulele chords, suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=can+t+help+falling+in+love+ukulele+chords+pdf In PDF document text
    • http://files.aofeathers.com/uploads/1/3/1/3/131398605/sukosagosomuz-rofagidib-nibis.pdfIn PDF document text
    • http://files.seinnnanog.com/uploads/1/3/1/8/131871740/56436190936.pdfIn PDF document text
    • http://files.nicaraguaforchrist.com/uploads/1/3/0/8/130874246/jimusefufigupub.pdfIn PDF document text
    • http://files.freestylefitness.nl/uploads/1/3/1/4/131406811/8700030.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/1/0431/4506/8699/files/canon_in_d_classical_guitar_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/17924455966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/negezimosob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/67013548067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1011/2163/files/catenary_equation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6915/2159/files/62763980604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/pafozirez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/81283423117.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7361/7568/files/restaurant_inventory_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/ors_ogden_utah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/nukifelubopixupixofi.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_off00005049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5049 5444 bytes
SHA-256: 93d0b310d1be6f6f876d4be2f7c1e77a35510b5226be396e7e0577e9117dc448
font_01_sfnt_off000062d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D7 14536 bytes
SHA-256: c373851653972292d31865cf12bd0ef2bfeff1026d0f1627d5966774319b4a06

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