Malicious PDF — malware analysis report

Static analysis result for SHA-256 237b26ff609baf43…

MALICIOUS

PDF

37.1 KB Created: 2020-08-14 22:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b370004d7a7edc199541edf6544346ba SHA-1: 09857c54478f473d7c080bbd75cf7c539694bf44 SHA-256: 237b26ff609baf4361312be7109b7da166a6343ecc19c4acb4ace77f6f335824
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of embedded links to external PDFs, suggesting a link farm or SEO poisoning attack. The primary malicious URL is https://ttraff.com/wb?keyword=el%20credo%20en%20ingles%20pdf. The document body is heavily obfuscated but contains references to the wkhtmltopdf tool and a date, indicating it was likely generated programmatically. No scripts were extracted from this sample.

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.com/wb?keyword=el%20credo%20en%20ingles%20pdf In PDF document text
    • http://files.han1image.com/uploads/1/3/0/7/130776208/f11c748e1.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/1/0435/9903/6579/files/farm_animal_coloring_pages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8392/1563/files/metojodawebijidakakevoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0096/9896/files/tibet_life_and_death_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2783/0696/files/chicago_apartment_lease.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/50573336225.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/root_canal_treatment_procedure_step_by_step.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8617/6675/files/pewaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/29659139179.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 3

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_off000054d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54D3 5072 bytes
SHA-256: 6e07d72150863d7996e31ab35fdb61f11c3cae9a1a575d8c7d69ee57fe349459
font_01_sfnt_off00006623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6623 9936 bytes
SHA-256: 9a1331af747c8aa24296d07289315dafa659d39e94f6e2f4068b2f691ad03442

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