Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b2a497113f5440…

MALICIOUS

PDF

42.4 KB Created: 2020-11-05 02:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-04-06
MD5: 36cfee3edebd3a145973790043f60f6d SHA-1: f5b612a515703e2884463676b5bc766d1d8f6739 SHA-256: a8b2a497113f54402773fd2b51119d29958e2335219824932f34c749dd526439
134 Risk Score

Malware Insights

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

This PDF document contains embedded links that redirect to malicious infrastructure, masquerading as educational content. The primary lure appears to be a 'rational numbers worksheet kuta', which, when clicked, leads to the redirector URL. The ML classifier strongly indicated maliciousness, and the link analysis confirms its role in directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/wb?keyword=rational%20numbers%20worksheet%20kuta In PDF document text
    • https://jekodijup.weebly.com/uploads/1/3/4/4/134490718/0df8dd3e4a83.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/ezan_duas_arapa.pdfIn PDF document text
    • https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/e62b60f530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5f8fbe09318da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5fa1f24abe860.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/1950998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5f9ec8da089dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f8d711b13b1d.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/74047600061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5f97858594363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5f8fb4313395c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f8765dcb0542.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/charlotte_s_web_reading_studios.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/basic_concepts_of_object_oriented_programming_in_java.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006828.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006828.bin)
    • https://uploads.strikinglycdn.com/files/8670dbaa-dce0-459a-b764-2b3ff50d2676/amazon_prime_mom_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc26a82-417d-4c69-9c14-1482399911f3/92175809982.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 extracted file (font_00_sfnt_off00006828.bin)

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_off00006828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6828 5228 bytes
SHA-256: d02d3413d3dffc990c41c490485a40750634ab84244b3092791ed3abf1793f72
font_01_sfnt_off000079d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79D7 10396 bytes
SHA-256: f0e07c42b1960a1c66764698a3fa92b3da3ad0b9b2e7a413184c75fbbacad94a

Open this report in the interactive analyzer, or submit your own file for analysis.