Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8b69447b95e0bc…

MALICIOUS

PDF

44.1 KB Created: 2020-08-20 13:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 81667c5c60cb83084a5042602bb838a9 SHA-1: 162419adfd626a65dc74e73ff3711bbacebddf94 SHA-256: 9c8b69447b95e0bc546c8a8938b10d025ce4db94c07d68e19a4c88732a544e1a
194 Risk Score

Malware Insights

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

The PDF file contains a link to a redirector URL, which is a common technique for delivering malicious payloads or phishing pages. The document body suggests a lure related to 'Cambridge written placement test answers', aiming to trick users into clicking the malicious link. The presence of a link farm further indicates a malicious intent to distribute content or traffic.

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=cambridge+written+placement+test+answers In PDF document text
    • http://files.currenteventcomedy.com/uploads/1/3/1/3/131383580/mukogubesejuka_jefotizogi_zajipu_fosiwixavijaw.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/1/0431/5791/3749/files/gifenukigaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/50073568311.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/hyundai_sonata_2013_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/internship_report_sample_petroleum_engineering.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/muzajufojamamofafekimot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/8790/8264/files/air_force_question_paper_2020_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1626/3592/files/fenland_fisheries_catch_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/edital_concurso_prf_agente_administrativo_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2772/5474/files/pivegexadaxeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1476/4190/files/91224753357.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/wumadezef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4952/4127/files/68713934725.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0655/7347/files/65284499162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2328/5928/files/68562001669.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_off000062d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D9 5532 bytes
SHA-256: 0702da1b9e630a5b601d1dab9f92dbf61cbcf434b238ff2b85785a8a31009923
font_01_sfnt_off0000759d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759D 15000 bytes
SHA-256: 8f56d9b754809f13c506b3e55e3e838ef4237214e125303df3016ab154983b10

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