Malicious PDF — malware analysis report

Static analysis result for SHA-256 631f70b31c59772f…

MALICIOUS

PDF

40.1 KB Created: 2020-09-20 00:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 12e4f7e22aa22ffdbeca11964fbf3d4f SHA-1: 4a6835e1bd2648af19e9648a1109593e146232e3 SHA-256: 631f70b31c59772fc007b7d7a0ed8ca4aefb595462b8190c734d18813baaf29c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body text, though garbled, includes a URL that matches the redirector, suggesting a lure to trick users into downloading potentially malicious files or visiting phishing sites. The ML classifier strongly indicates 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.me/wix?keyword=chemistry+puzzles+and+games+answers In PDF document text
    • http://files.camarillospringsseniorgolf.com/uploads/1/3/0/7/130775055/sedotanopopare.pdfIn PDF document text
    • http://files.jadeyoga4health.com/uploads/1/3/1/4/131452811/66f20c.pdfIn PDF document text
    • http://files.christianbaptist.ca/uploads/1/3/0/9/130970008/tulovinebu_jowupasi_xofakapuxede.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/1/0435/2707/8052/files/divinity_2_fire_cloud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/jovofivugaroni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/9876/6231/files/cpcsea_guidelines_form_b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7622/3129/files/fizuwugilurodugusativejiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1523/3959/files/erik_erikson_psychosocial_theory_and_education.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6195/9073/files/nunuzamufexovuluvedawus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/utility_theory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7498/4863/files/the_outsiders_writing_prompts_by_chapter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4032/4256/files/13631238127.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2843/7409/files/sazapuzunukipajubetora.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_off00005ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC4 5520 bytes
SHA-256: fcbb6326e20db14a061d8b86ee91d28f1e1540fa4a05e3f2006a227436bef283
font_01_sfnt_off00007178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7178 10012 bytes
SHA-256: 1db7114ff28d04915fec1b74a78c155791fe0fbaeb6c380922b0f68eb822c7cd

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