Malicious PDF — malware analysis report

Static analysis result for SHA-256 258f3ae276ed74c5…

MALICIOUS

PDF

45.9 KB Created: 2020-08-24 21:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2e630df4e039a0e0cab00bd0b083c01f SHA-1: 7ad45485aa287749494bc2aebee7c6cc5fcb0259 SHA-256: 258f3ae276ed74c5a2152a616af26a6e9f5f19432081daba8d89f954de48cde6
194 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm strategy, aiming to attract users through SEO-like content. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword related to horseback riding to disguise its malicious intent.

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=horseback+riding+guided+trails+near+me In PDF document text
    • http://files.andrewmowen.com/uploads/1/3/1/0/131070845/97f54.pdfIn PDF document text
    • http://files.centralbrowardtransitstudymeeting.com/uploads/1/3/1/8/131871586/vemid.pdfIn PDF document text
    • http://wibevire.gillilandhcwildrags.com/uploads/1/3/0/7/130775407/lipetu_mepinu_bebisifuzegivev.pdfIn PDF document text
    • http://nosom.eurekasecondaryschool.ie/uploads/1/3/1/8/131856887/155458.pdfIn PDF document text
    • http://zutanilot.rockinwblueticks.com/uploads/1/3/0/9/130969130/16bf09.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/1/0431/1361/1413/files/convert_utc_to_pst.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0447/2992/files/6482525400.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/34279979631.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/tegov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/bovanolepuruzaxezewidosir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0243/6518/files/17790285653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5044/0603/files/shutter_speed_shooting_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6503/1321/files/64812951995.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/80068947896.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_off000075d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75D8 5424 bytes
SHA-256: 561b548c9f1d1e98fe432bdb8c60d3335842c2412cb86fbd8d388cc4a3a88bb6
font_01_sfnt_off0000882b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x882B 10088 bytes
SHA-256: 836935cffe9215673158d19e4c901c64626c1b1e90a620cbcf32224319be7005

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