Malicious PDF — malware analysis report

Static analysis result for SHA-256 664fe4dcf3497a42…

MALICIOUS

PDF

43.3 KB Created: 2020-08-04 09:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1ab02ad5291a301cb202bef2d41a9f01 SHA-1: 66ee2e2bce2de48c2b35279e5dc6871aed054cfb SHA-256: 664fe4dcf3497a426775251eddd47436be64829a28a5272b1c2516eb5af19e3d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to an SEO redirector, which ultimately points to malicious infrastructure. The document body text, though garbled, contains a URL that is also present in the heuristics, indicating a likely attempt to trick users into downloading further malicious content. The ML classifier strongly supports the malicious verdict.

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=allotropes+of+carbon+notes+pdf In PDF document text
    • http://files.mcminnvilleaircraftmodelers.com/uploads/1/3/2/7/132712043/mejine_rogozadet.pdfIn PDF document text
    • http://files.eaglemountainvolleyball.com/uploads/1/3/0/9/130968956/d7a91012f.pdfIn PDF document text
    • http://files.kickskloset876.com/uploads/1/3/0/7/130740183/tebeduxibodiwoko.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/1/0430/6498/3703/files/zisuwumamopobaxez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/napunajatojazadogimawaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/cch_chuyn_t_sang_file_nh.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43106273748.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/tukamimupoberip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4058/7423/files/convertir_a_word_editable_ocr_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0341/0589/files/eu_blue_card_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1204/6491/files/completed_staff_work.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/fevaziwoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3989/9304/files/sukilij.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_off00006c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C00 5276 bytes
SHA-256: d6d54ce5641d13a082d1c28430a7997d6e3570c4a30db329ff0d02a07f5db58f
font_01_sfnt_off00007dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFC 10152 bytes
SHA-256: 8637d8da3b430827e62a0f1af78aec6144411a83c694c6379a71fbd578f6bb84

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