Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbea7dcbcc3684cd…

MALICIOUS

PDF

39.0 KB Created: 2020-10-27 00:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12b0f0759eb7f30320475bcc452d71f5 SHA-1: 9a6289a00354768590777f65af12f093b873121b SHA-256: dbea7dcbcc3684cda122e21f2b47107ec0dad602c3706c95c1fc88d0ad9afd34
94 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a known malicious URL, disguised as a school calendar. The ML classifier strongly flagged this PDF as malicious. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ggtraff.ru/strik?keyword=2019+and+2020+hillsborough+school+calendar
    • https://cdn-cms.f-static.net/uploads/4408989/normal_5f939426f1f4f.pdf
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5f92860f831f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/towakog/kemititirenasusatibaf.pdf
    • https://s3.amazonaws.com/nitajosasa/alkenes_and_alkynes.pdf
    • https://s3.amazonaws.com/sivanira/dowipinimarubirigewit.pdf
    • https://uploads.strikinglycdn.com/files/a62f83dd-18e2-4039-b6c5-b7fff4150bc0/sonic_the_hedgehog_3_play_online.pdf
    • https://uploads.strikinglycdn.com/files/a45b0de6-010b-4af5-ab06-6abfed65aacb/movomu.pdf
    • https://uploads.strikinglycdn.com/files/0c559d51-7afa-42ac-8e7f-1570d962a96c/23673589467.pdf
    • https://uploads.strikinglycdn.com/files/e2dd7f52-7805-4e59-af1f-8df038bd3df5/10343223053.pdf
    • https://uploads.strikinglycdn.com/files/80b2793d-ceae-4bf5-a3cd-e195ab16f982/96842356452.pdf
    • https://s3.amazonaws.com/wapabefizosumi/curso_auriculoterapia.pdf
    • https://s3.amazonaws.com/nisoxow/organic_compounds_containing_nitrogen_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0503/6729/9782/files/bafuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/9986/2680/files/97014680439.pdf
    • https://cdn.shopify.com/s/files/1/0496/0550/9271/files/99_ball_blast_mod_apk_revdl.pdf
    • https://cdn.shopify.com/s/files/1/0496/2680/8484/files/15882513245.pdf
    • https://s3.amazonaws.com/pazovugal/skripsi_manajemen_pendidikan_islam.pdf
    • https://s3.amazonaws.com/zuxadol/simple_ordinary_annuity_problems_with_solutions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058f5.bin
7ea41291ee9c28e855ea6f0a4d6785633645d3346ae1610b2b1595b262c4a639
pdf-font-stream PDF embedded font (sfnt) at offset 0x58F5 5728 bytes
font_01_sfnt_off00006c55.bin
1204535892992d6c8531734def9d59e36e387dea3c4d1d98755f44416ad0d158
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C55 10392 bytes