Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3c645bbf58b82b…

MALICIOUS

PDF

62.4 KB Created: 2020-10-01 07:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-19
MD5: a223cff3c9a753957a020eb7e29a1c2f SHA-1: a16e691ddd72d83aebb12f3563fc67dba922f2c0 SHA-256: 4e3c645bbf58b82b1480c5cb246ef41605ffd12b4f9c669198a6d1fa0c076016
194 Risk Score

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://cctraff.ru/strik?keyword=teoria+sobre+el+aprendizaje+significativo+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d8f674-87d7-4a9e-89c6-dc9119f1f557/70799018120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ac659a-425d-4e5f-a2b8-7f391778c66d/41939879887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd926432-05f5-43a2-a64a-0727c9e9245f/doxobopugawebil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0708e1e1-0dd1-4018-9ba7-b91288a3cada/17995106500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037e3120-364a-4cfb-b500-1a5482b1a03b/53951626998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24711f1-be4b-4f87-9653-4fc2b67e4680/22934871884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3633/4485/files/66340298399.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9892/2403/files/zifakoludipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4261/9035/files/99109396676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/wubonud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/behringer_mixer_xenyx_802_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/23420906152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1157/0838/files/badland_apk_full_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4145/4240/files/99_names_of_allah_with_urdu_meaning_and_benefits.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/8130/8829/files/apc_back-_ups_es_550_manual_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0324/7781/files/piteturobamixarubodebagul.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FE 5596 bytes
SHA-256: ae8e6df6acd5adca358bfb18ed0fe9d38365efbca075f38668621d12e8eb4154
font_01_sfnt_off0000c52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52A 11512 bytes
SHA-256: 37b95b1e92e97a6398b002aebe3ebdfa4a34373b7041944e358d208da7664622

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