Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc09e17bc81ea7b…

MALICIOUS

PDF

52.5 KB Created: 2020-10-26 01:25:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 37ef53945491486da59316b37af6cf78 SHA-1: 9fa65606140ced4f75c49b6cd611f6220746068d SHA-256: 6bc09e17bc81ea7bf5d0da5be2f20b94063c622e698a5e5324ee520275f781a5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure. One URL, https://cctraff.ru/strik?keyword=zen+text+guide+mystic+messenger, is explicitly flagged as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the PDF is designed to lure users to malicious sites, likely as part of a phishing or scam campaign.

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.
  • 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://cctraff.ru/strik?keyword=zen+text+guide+mystic+messenger In PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/0399a0a.pdfIn PDF document text
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/0d5d637.pdfIn PDF document text
    • https://walinakonefal.weebly.com/uploads/1/3/4/3/134316097/fb99dd7214a.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/9333405.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/5515325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5f88b6ea67eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f927f4f9fed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f902c23ed43b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f8c188485584.pdfIn PDF document text
    • https://merasewutid.weebly.com/uploads/1/3/4/3/134348660/jujawinakemetugu.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/voxapozizusi-masazop.pdfIn PDF document text
    • https://tuvozejuwubox.weebly.com/uploads/1/3/4/3/134323710/mixatipeg-vivap-luvefoguvalu-sinawef.pdfIn PDF document text
    • https://nojefawagalubab.weebly.com/uploads/1/3/4/2/134266261/db8ad7.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/pawotexoxaramitase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f8813550f56a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5f8e8ea21b381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5f8d572e4dc69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f8e25f78cfa9.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/1/0500/5328/4008/files/carcassonne_expansion_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7597/4821/files/30667522220.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5649/1417/files/66432603801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f807de-5e26-48ac-b930-9364573d162a/20089531497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2287cc8f-8ed9-4660-a811-1c8daf8dda80/wavepad_sound_editor_5.55_registration_code_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27614ee5-8907-4bcc-a01b-129338ee396b/guerras_carlistas_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d78195e3-b5ca-424f-9872-2cdf92c8792e/biwavolaxexusut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b7a7ff-8423-4c6c-9de4-367e10d7e297/33893679071.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_off00008be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE2 5144 bytes
SHA-256: e2ef5bebdd83a42ac3fdd873b0081603c2379c32e942bb7d546bf6474a96d1e5
font_01_sfnt_off00009d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D5F 10868 bytes
SHA-256: 8f65620d074ed16e7a35ef2c5607ff30e19bc982020e14573232df59602de0f8

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