Malicious PDF — malware analysis report

Static analysis result for SHA-256 636d4dbf127fe89a…

MALICIOUS

PDF

39.1 KB Created: 2020-08-17 11:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 45cf7e123107761e1dcdbb5a0688ec7a SHA-1: 11dbeb6d162a6ed2b63f20c8d780a0d2d48c4dc8 SHA-256: 636d4dbf127fe89adad1c71003e5a6b647807767df6308277aaa33b43e864747
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary redirector URL, 'https://ttraff.cc/pify?keyword=bcd+to+gray+code+pdf', is flagged as malicious. This indicates a phishing or scam attempt, likely using SEO tactics to attract victims to download seemingly legitimate documents that instead lead to malicious sites.

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=bcd+to+gray+code+pdf In PDF document text
    • http://files.laurenmelodyshell.com/uploads/1/3/1/0/131071082/wuxidojidinud-rojod-sosapigeluji-pogemupurojev.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/1/0428/2286/0956/files/debusabetipedemutus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/black_sheep_movie_in_tamilrockers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/xogatakaruxenugiludoduvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3283/6256/files/employee_interview_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/informe_de_levantamiento_altimetrico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2102/3904/files/writing_equations_in_slope_intercept_form_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8203/1007/files/33896047462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7236632937.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/used_car_bill_of_sale_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/fakibepifa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8530/6782/files/big_data_ebook.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 1

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_off00005cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB5 5264 bytes
SHA-256: 0a96fa8c8b2ade55a251c76250c9132c36af91ed14e9c9ccbcc154ecea33c174
font_01_sfnt_off00006eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAF 9832 bytes
SHA-256: f2aa573523d5ac50c3c17c8c02a6ded8a2d7699ffda4f1a4872d4f0472061593

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