Malicious PDF — malware analysis report

Static analysis result for SHA-256 66175cf1bbab0b22…

MALICIOUS

PDF

44.3 KB Created: 2020-08-09 00:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1e7ab3551d4251479cb92db8d22aa64c SHA-1: b98968a912b4b6c20ddc4b565298e734ac9bc9e4 SHA-256: 66175cf1bbab0b2257c1448198ecc4792d9af6b1f0d7fe989625c80b215eabc2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with a critical heuristic identifying a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=computational+thinking+skills+pdf, suggesting a phishing or scam lure. The ML classifier also strongly indicated maliciousness.

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=computational+thinking+skills+pdf In PDF document text
    • http://files.michaeljamesoberhauser.com/uploads/1/3/2/7/132740892/fdc47c1a0b2796.pdfIn PDF document text
    • http://files.lovemehemp.com/uploads/1/3/1/6/131636697/5453001.pdfIn PDF document text
    • http://files.warriors4god.com/uploads/1/3/1/3/131383478/bozivixofevozesi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/backgammon_rules_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/1870/2247/files/area_of_trapezium_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/32328811206.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/3745/3470/files/bengali_e_calendar_1426_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/92463733176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0057/6669/files/blank_dd_form_214.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/27162120444.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/xegofisola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/an_introduction_to_banach_space_theory_megginson.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/fuvoxerixizavuresivop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5792/9622/files/palaxetejinukoraviwe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6367 5212 bytes
SHA-256: 54c9292313ec67a6acabfb2f3bb1c812de2da010f3470ce0776071be7c0afe89
font_01_sfnt_off000074ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74EE 9760 bytes
SHA-256: 5b5dc53c33a7080f8987c2ec8f19271370beed4974bd30b7e81a4f14bf3dbdfa
font_02_sfnt_off0000962f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x962F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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