Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c95a4b5039bcd18…

MALICIOUS

PDF

34.9 KB Created: 2020-11-01 14:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6c70209bd563464d56547d4d96026e19 SHA-1: ecf0c570145d4ce0e9599145ede353b85b67ce82 SHA-256: 5c95a4b5039bcd180e9a6798f05ac9d12a70cf8cca3ced53a5197c3ac6cf7061
94 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, disguised with text related to personal finance. The ML classifier also 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://cctraff.ru/strik?keyword=guide+to+understanding+personal+finance In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f935a3abba02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_5f8a2bbd9e1c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f91c79fe9b17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/40388925949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc34c66-c436-47b9-820f-3ed04bd5a24d/29796814650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5787904-a8ba-4796-8f2e-af0a34d74026/historias_biblicas_para_nios_cristi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f1f8aa3-9fb5-4855-864d-ef643a427257/nhng_kip_ngi_tn_trong_truyn_ng.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97965033-6633-4f60-abc5-559b576093ae/8834033798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b27e87-5892-4631-a228-471703fd73ef/kenemud.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/47632154798.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/the_woman_who_smashed_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad213ce6-0c94-42fc-8851-c0ba186b68b9/the_worst_mistake_in_the_history_of_the_human_race_questions.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_off00004d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D00 5352 bytes
SHA-256: 95d349142ddbc0b8bdcee486551877b7449e46448e0c59c516faa046de950343
font_01_sfnt_off00005f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F49 9292 bytes
SHA-256: 39c12796c057e2089effe95a58132a1203298a2edcfeaa133aab8865821f0ed5