Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33c0952920db56a…

MALICIOUS

PDF

56.7 KB Created: 2020-10-07 03:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: d4d8baf0ae46b8e46226be5fb3ebf56e SHA-1: 597a5184200c7646b28f3c943e8c6634abd61b0a SHA-256: c33c0952920db56a93bd37151ebd4dfa7df7a27d35f4658f20c9c50605338552
184 Risk Score

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=free+pdf+wattpad+stories In PDF document text
    • http://files.tconlogandesign.com/uploads/1/3/1/8/131871778/4964520.pdfIn PDF document text
    • http://files.caaeonline.org/uploads/1/3/0/7/130738993/zenamiraneki_kotopetafivobek.pdfIn PDF document text
    • http://files.vfwpost612.org/uploads/1/3/1/4/131407061/besoxovat.pdfIn PDF document text
    • http://gusuga.nekc.org/uploads/1/3/1/6/131606968/4920995.pdfIn PDF document text
    • http://surad.berkleysteelers.net/uploads/1/3/2/6/132695471/pesamogugudowo_vezidasaduzi.pdfIn PDF document text
    • https://site-1040601.mozfiles.com/files/1040601/fokuje.pdfIn PDF document text
    • https://site-1039634.mozfiles.com/files/1039634/9364604268.pdfIn PDF document text
    • https://site-1041489.mozfiles.com/files/1041489/90114782211.pdfIn PDF document text
    • https://site-1040174.mozfiles.com/files/1040174/buzujodofivev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/754331ed-6592-4376-b68a-9926a6469630/vidijivikuvonaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80433eb3-5517-4c00-812d-18f207bb3d5e/mixosam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae74f0f-588e-4d7d-94b9-761d4e005eab/33295835566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c728665-4b08-4371-9584-c7a1ac921e23/ziwuwiripetixumetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae355ad-1e70-4881-b40b-4f723ea06739/8102906714.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF0 5048 bytes
SHA-256: 33edcd3d7015f53c9644884f48bd4eec79887a52633446e2378322a7f86800b6
font_01_sfnt_off0000803b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803B 6328 bytes
SHA-256: 286d0d4daefae53bf57915e97a585f4a83179d4506f85cf1f307587edc521906
font_02_sfnt_off000096a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96A2 10864 bytes
SHA-256: 8629b0ca7614cf48a5f39415f6278047dcb6f4c357f706dc0535f398617f9683
font_03_sfnt_off0000bbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF7 17140 bytes
SHA-256: ada7162f0d5b5b1e72eee634d2b273d23a041fa515a756996bfae7873086e94d

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