Malicious PDF — malware analysis report

Static analysis result for SHA-256 01528278cdaddc9d…

MALICIOUS

PDF

34.4 KB Created: 2020-10-30 23:28:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 55f46738a0c017263b35d55bf654166f SHA-1: 3340972f22abef76031fed090f44bbb110b7089d SHA-256: 01528278cdaddc9d920f6f2c74dc7574235089629ebea6e03ae76055951a92f3
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?keyword=diversity+statement+law+school+reddit'. The ML classifier also strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of a malicious URL within the document body indicates an attempt to lure the user to a harmful site, consistent with phishing or malware delivery.

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/123?keyword=diversity+statement+law+school+reddit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_5f8f9d2f1b536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f982f613d2b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f8b5110aeff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5f92b1a7d8b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5f9bba6c287d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f89671c26e68.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/memul/absceso_dental_en_nios_tratamiento.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/37345243857.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/goganobovak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6bab88-9689-4c89-b31e-f77c468a33a3/5148828163.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/nusugasurijafenoxitaledo.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/the_human_brain_coloring_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/72646981969.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_off00004a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A2C 5432 bytes
SHA-256: 01cf24fab408fe7b8bc2a0e2d436240feef2e1854a9cd617276116257f26ae68
font_01_sfnt_off00005c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C97 9568 bytes
SHA-256: a5bd44ede3a76e94e1898c9f16cb082925faa32c8856b6cc09a020af82ed5d19