Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9fedf011b842d5…

MALICIOUS

PDF

37.0 KB Created: 2020-08-12 04:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 55bf8b24c44beb7eec45419275b5e842 SHA-1: b960c189e57714b77470da59fb774e46f025e473 SHA-256: 4b9fedf011b842d5c546fa5284241b888e89d31c4a5afeec8c66925cb3616999
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to textbooks and includes the malicious URL. This suggests a phishing or social engineering attack aiming to redirect users to malicious infrastructure.

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/pify?keyword=algebra+2+trigonometry+textbook+mcdougal+littell+pdf In PDF document text
    • http://files.grcrowfamily.com/uploads/1/3/1/0/131070190/3426f7e.pdfIn PDF document text
    • http://mubovimux.istemeducation.com/uploads/1/3/1/1/131163763/6914879.pdfIn PDF document text
    • http://files.movehelix.com/uploads/1/3/1/4/131483025/775146619.pdfIn PDF document text
    • http://files.mypromobook.com/uploads/1/3/1/3/131381602/jazafovu_saberufuvatol_vebijarudigez.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/1/0432/8669/1998/files/95196475855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/laporan_pendahuluan_hernia_inguinal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1765/6731/files/lowes_warrensburg_mo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/lawejaforofipa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2353/0141/files/13073567979.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2001/6021/files/95795158576.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8343/9003/files/pirates_of_the_caribbean_easy_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/82560768394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/55314676061.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9733/3664/files/pafezaxuvenamofi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0549/9803/files/95927664163.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1986/0125/files/diferencia_entre_anestesia_raquidea_y_epidural.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8548/6498/files/kebisoxavo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3202/6008/files/agenda_2020_imprimir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/30473844290.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 8

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_off00005124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5124 5792 bytes
SHA-256: d8289350220343bbd8fdcf7dce495e501cc6fbb832a1082583014743e27f1316
font_01_sfnt_off000064cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64CF 9912 bytes
SHA-256: 5e6b6f93f215d2b77c08f7532764209732e89728cf1a786a48568cff03186cfc

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