Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f8f7c6df8f98a4…

MALICIOUS

PDF

38.6 KB Created: 2020-08-04 21:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bb25b98df40f17bf8aa32d65b40af080 SHA-1: f667c347974f9e40b7b9c1e96a4e92b9569129b6 SHA-256: 23f8f7c6df8f98a47075fbc713434c0b2ca1fcbf4cb4d33c933ea1c853eb7679
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as a curriculum document. The primary malicious URL is https://ttraff.cc/pify?keyword=critical+care+transport+core+curriculum+pdf, which likely leads to a further stage of the attack. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a content-scraping or SEO-based distribution tactic.

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/pify?keyword=critical+care+transport+core+curriculum+pdf In PDF document text
    • http://files.diabetesuniversitydmcp.com/uploads/1/3/2/8/132815791/5277034.pdfIn PDF document text
    • http://files.januszsupernakwebsite.com/uploads/1/3/1/3/131380171/fatukimelak.pdfIn PDF document text
    • http://files.sunriseonlinenews.com/uploads/1/3/2/6/132695546/pexidoluzapafepabiso.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/1/0433/7870/4549/files/87918494078.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/fetugagab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/89372312367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4339/7525/files/alphabet_english_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/fevar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/jisaniruwumodesopijonezaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufalelavajukunegaxiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/61791795816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/vogekupefifenavomaliguba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/50778066535.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/pillars_of_eternity_garodh_s_chorus.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4429 5208 bytes
SHA-256: 6f7cc4e777ce00bd69ff38773e4163ec002f82803796617f6b87849328f20a16
font_01_sfnt_off000055c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55C2 9956 bytes
SHA-256: 96a28abd4f1ed798065ed367aae47ce26b6c00779b16b58cf6f667b5f1c31635
font_02_sfnt_off000077fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77FD 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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