Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ebb665c5d3278e…

MALICIOUS

PDF

51.1 KB Created: 2020-08-15 23:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d88cf68c2367b19ebe4511a3958ddb8a SHA-1: 33bce448b035792d3169e44178c0b113dc70b408 SHA-256: 81ebb665c5d3278e539e36f42d6c481a06f26b4ae856f5ce040351a507213355
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL pointing to a malicious redirector and several benign-looking Shopify URLs, suggesting a link farm or phishing lure. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the presence of embedded links and the redirector URL strongly suggest an attempt to lead the user to malicious content.

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.cc/wb?keyword=visualization%20data%20pdf In PDF document text
    • http://files.blainesworld.net/uploads/1/3/1/4/131453084/7289384.pdfIn PDF document text
    • http://kuzosekag.seomid.com/uploads/1/3/0/7/130776394/vanakivodul.pdfIn PDF document text
    • http://files.stgeorgestbishoyvisalia.com/uploads/1/3/1/4/131437750/438653.pdfIn PDF document text
    • http://files.foundationofhope.us/uploads/1/3/1/4/131437862/sutekufo-lisuvizobuxe.pdfIn PDF document text
    • http://files.essentiallyempoweredwellness.com/uploads/1/3/1/0/131070604/03996.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/1/0430/3133/0969/files/19720676873.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63529720688.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/fg_knot_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1056/4002/files/79722218856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3332/7776/files/zonerotifujazupomerokeben.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/all_the_way_piano_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7309/3288/files/zekusedaladujutujumeraw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0539/3571/files/file_association_helper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8755/9833/files/49241123688.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/midadekefabuwekiwelukufus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1941/0328/files/13708430635.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_off00008751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8751 4952 bytes
SHA-256: 79bbf2db5ebb7cde5f3bd8f844ddef848624471ebd0dbaced4cc6366b605b056
font_01_sfnt_off0000984e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x984E 12700 bytes
SHA-256: 2467b6b5151b70c11951a4ba2d1809d17f7d7b2f48191434d28510ca4a186097

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