Malicious PDF — malware analysis report

Static analysis result for SHA-256 66de4373d3648b3e…

MALICIOUS

PDF

35.6 KB Created: 2020-08-15 15:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 915d0d627a31e5cd62d04754f8a32883 SHA-1: 3a5999edc3632ef5ba84ca570c85761139f368ff SHA-256: 66de4373d3648b3e70b03f25dfc3d717c5b879e49bcf114ebdef9eb3540e5572
194 Risk Score

Malware Insights

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

This PDF file contains multiple 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 the primary lure. The ML classifier strongly flagged this PDF as malicious, suggesting it is designed to redirect users to a malicious site, likely for phishing or malware delivery.

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=lpg%20co2%20system%20manual In PDF document text
    • http://files.kittsonskitchen.com/uploads/1/3/1/8/131856232/a37fa16fe42.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/1/0436/7728/6565/files/88407523831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/cornelius_castoriadis_biografia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/53655514948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/taiwan_rail_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5082/7929/files/dadaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/scanned_to_editable_word_converter_online_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7413/9813/files/zitoratamakaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8986/1535/files/zepezorinuvazofajoxewelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/gazefowaxijupakofufikurav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5466/0758/files/57422167248.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/85323849460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/32837789289.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 2

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_off00004cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF9 5332 bytes
SHA-256: 3fc4c0736ec18b1b2da042183869ab067918f7ddce24c230b5b0f7da0ccb455c
font_01_sfnt_off00005f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F19 10184 bytes
SHA-256: 2a8f6349692a7e862dc0b2630ac00f0e642cd998e90d3d8757edea682aca26cf

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