Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2421523131e5a8…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 21:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 280a1ac1bf5d0219d5c5063a94728058 SHA-1: 244eca5b1b57d51e885ddc3aeaa26f1ca00de98b SHA-256: 4c2421523131e5a82d89195837ca26f0c2f36d58aab983f79b4017bedc3436f4
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, indicating a link farm or a distribution point for malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of numerous Shopify-hosted PDF links suggests an attempt to leverage legitimate platforms for hosting or distributing malicious files.

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=the%20last%20lesson%20alphonse%20daudet%20pdf In PDF document text
    • http://files.photosandfootnotes.com/uploads/1/3/0/7/130775934/rejumoropafixaxagol.pdfIn PDF document text
    • http://files.silverjinnstudios.com/uploads/1/3/1/3/131380944/lekunupak_xumekuvolo.pdfIn PDF document text
    • http://files.bedfordptfit.com/uploads/1/3/1/3/131383319/9690221.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/1/0435/4641/1160/files/artificial_intelligence_journal_paper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9744/7836/files/waduwerepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6130/4727/files/ccie_data_center_v2_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/calculus_by_thomas_10th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/21385380312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/12930210535.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6952/1568/files/deductive_reasoning_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/ponexifojijuxemafuzowowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4659/0872/files/calendario_mundial_2020_imprimir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7361/7568/files/bloodborne_forbidden_woods_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1682/9603/files/7001717973.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 5

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_off00006762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6762 4980 bytes
SHA-256: 2522ee48f9f307d0280c9fa4bd0190c1951fe3dfc8c9453d58699ed818349770
font_01_sfnt_off00007851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7851 9888 bytes
SHA-256: 0d1b26fb9b9b993655ed653d2fa400bbaa909c82ad22928d440b9c67e0c085cc

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