Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bcef8bb564e240…

MALICIOUS

PDF

42.1 KB Created: 2020-08-12 01:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bd362ea5ce7a99e141b16cb015251306 SHA-1: 2e566d9eed29752cb412014b1182819b1d7f2ff2 SHA-256: 53bcef8bb564e240b09ee8b2f27abc81d56535fb6b3184cc01fc1f3ddcfe301b
194 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text "Writing task 1 questions pdf" and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF also exhibits characteristics of a link farm, with numerous external links, further supporting a malicious intent to redirect users.

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.com/pify?keyword=writing+task+1+questions+pdf In PDF document text
    • http://files.orlandohomeinspectionservices.com/uploads/1/3/1/4/131437937/farupajamamonababu.pdfIn PDF document text
    • http://files.roejendradesigns.com/uploads/1/3/1/4/131406762/wugagumigejo.pdfIn PDF document text
    • http://files.adammichaelmcgee.com/uploads/1/3/1/3/131380616/jejevupezu.pdfIn PDF document text
    • http://files.homehealthandhospiceanswers.com/uploads/1/3/2/7/132712115/namafijom-vamenuxigira-fumebokidilafi.pdfIn PDF document text
    • http://files.chililibrary.org/uploads/1/3/2/8/132814977/8038795.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/1/0431/2819/3184/files/rakosujuwisaxuritas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/fire_risk_assessment_guides.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2293/4435/files/how_to_write_a_lab_conclusion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6706/4991/files/44331537366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/febigonaseso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/30806378442.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/79423883767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/pewoxog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3337/0522/files/74503413737.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1988/3928/files/biology_textbook_for_high_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1256/1819/files/network_cable_crimping_types.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/nejejedobevenubom.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_off00006736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6736 5432 bytes
SHA-256: 547974b62f897e96becbfac267fdf9fe4b08fe7bd3fdda2212ac70db516feccc
font_01_sfnt_off000079cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79CF 9876 bytes
SHA-256: 4891162d66c6a743b760919a72c2765f2b32243878698b421f08c7c68022d407

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