Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c40dac8e0a87c77…

MALICIOUS

PDF

39.4 KB Created: 2020-10-17 22:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 11f1ad8f74459541f34fc679cfe2aebb SHA-1: 70d57af059c1781cab17902124f676a755e54d3d SHA-256: 5c40dac8e0a87c77ea13ead99c013bff8ce7064346bdd69a503b7297aa0767ee
124 Risk Score

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.ru/123?keyword=free+suffix+worksheets+for+5th+grade In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f86fbe813bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f8aab0beb9a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f893cd2dac79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f87aa119a792.pdfIn PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/vaboxa.pdfIn PDF document text
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/d7e08.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/700644.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/0cbd7f35736ab.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/widamaloza_zumubik_sigovegataberag_gesutoxumogo.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/pejajofedaxevaw_kozadesupuke.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.pdfIn PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/98daf3771c40a6.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/1/0483/5799/8743/files/58297740500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bb381c-98d8-4745-9239-8fbb656e4bac/bebevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c78f8a-2169-499d-b995-4519d77c791c/85397488135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a7e250-15ad-44e1-a89f-71d43f0aca2b/kutozevazaxesiradonar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e3bdf8-d213-492a-835e-77f522dc1faa/kifavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75ca086-996c-4cd6-a965-e072c0b75d88/99810797462.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A90 5440 bytes
SHA-256: 4577a706fae5207e1fb51d2d5ab95b47b1ed5ff8daa33b64465ff201ef919f32
font_01_sfnt_off00006d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2B 10332 bytes
SHA-256: 1617ea4818c952701b98e56aef588144720dcbe1ce01b9ce5d53addc6fa768bc

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