Malicious PDF — malware analysis report

Static analysis result for SHA-256 973943eddd463b90…

MALICIOUS

PDF

43.7 KB Created: 2020-08-13 08:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: badb420d3e844042a5d30364a1a43748 SHA-1: eff5b41a4025155037014e564f13f3432ecd5d02 SHA-256: 973943eddd463b90d94770e4e00a64af408cc12f2e99bc17e362580ce96f72df
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the heuristic findings, including a primary malicious redirector URL. The presence of numerous embedded links suggests an attempt to lure users to external, potentially malicious, sites.

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/wb?keyword=animal%20welfare%20articles%20pdf In PDF document text
    • http://files.matandnick.com/uploads/1/3/1/4/131437886/lurumete.pdfIn PDF document text
    • http://files.spiritrestretreat.com/uploads/1/3/2/6/132681826/8435354.pdfIn PDF document text
    • http://files.dallasmendingminds.com/uploads/1/3/1/3/131381720/2306788.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/1/0431/0643/5232/files/33168382819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3920/3221/files/31564841631.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6961/8841/files/45357721613.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2707/0104/files/81373744985.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/34973333728.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/nopakepeguw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5957/6986/files/business_studies_grade_10_essays_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/bonaire_tourist_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/football_manager_2015_megapack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0939/2285/files/64604748701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/31199345707.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 7

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_off00006b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B97 5384 bytes
SHA-256: 196c26bc123fe37ec339e93b5ba34fb86cf51b51e8a461f076b25f0033b06cc1
font_01_sfnt_off00007dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD0 10684 bytes
SHA-256: c720f2f61b0ba209dc2b76e3f9867f0ec1a1f4675f2be4c138fa673d8e149fb8

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