Malicious PDF — malware analysis report

Static analysis result for SHA-256 6520b4826c377f56…

MALICIOUS

PDF

42.5 KB Created: 2020-08-21 13:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 25bb490849ceffb11504d053ae7c3e38 SHA-1: 500ec319d92ecc3efe2b2491d5ff41c145b1f760 SHA-256: 6520b4826c377f5605c179f3ab5723abeba775436cd1aae664573b3e54b4c023
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to appear as legitimate downloads for coloring books, but they redirect to malicious infrastructure. The heuristic firings indicate the PDF is a redirector link and part of an SEO link farm, aiming to trick users into downloading malware. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=abecedario+para+colorear+con+dibujos+pdf In PDF document text
    • http://rejuxokob.woodridgeart.com/uploads/1/3/2/7/132712358/witevuputas.pdfIn PDF document text
    • http://rifow.thezezimas.com/uploads/1/3/1/3/131398560/391deb9e00.pdfIn PDF document text
    • http://wifebate.havayah.com/uploads/1/3/2/6/132682076/c0e2e936e.pdfIn PDF document text
    • http://rijop.jackjackterlibrary.com/uploads/1/3/1/1/131163846/rijujome.pdfIn PDF document text
    • http://nawemoru.denisegnorris.com/uploads/1/3/1/0/131070374/durezewejomog.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/1/0435/4716/4840/files/xaxawesifuluxezizogakiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0633/6930/files/dirozobugizakemipaxugebed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/6505/9997/files/terozudidex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0725/8278/files/42420517075.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7353/5129/files/elements_of_calculus_and_analytic_geometry_thomas_finney.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/duvefusore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/8404/2655/files/number_of_faces_edges_and_vertices_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0830/8901/files/46478278983.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/kindle_and_boom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/breeding_and_seed_production_of_finfish_and_shellfish.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4516/5975/files/gozemamakogesifazigosoja.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_off000063d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D7 5356 bytes
SHA-256: 0ce22abf03ce79d0a27305fd732e5a63faa869ed3b04e02f7cff1a3bd9cfab0f
font_01_sfnt_off00007611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7611 11252 bytes
SHA-256: a5bbdcb2f3864ee14cf01ce5c8078037cce185e43f3537e1df5925839396ea00

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