Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6871b1413777be0…

MALICIOUS

PDF

34.6 KB Created: 2020-11-02 07:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1b43dfdb585b54ad86a6a39207ee5443 SHA-1: ed043c883617207577a1518ba0e3132dfda0dafb SHA-256: f6871b1413777be0451a005b2cbb019226f0d79e80a6485419deeb876b79cea9
94 Risk Score

Malware Insights

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

This PDF file contains embedded URLs that redirect to a known malicious domain, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to game cheats ('Awesome tanks 2 unlimited money'). The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which is likely used to deliver a second-stage payload.

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=awesome+tanks+2+unlimited+money In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5f8caa0588adb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5f9b16b94285f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f9ce00e1be1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f899175347a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5f9c4c9c8ce63.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/93f17276-987a-4340-b151-3333693af5e8/64332876633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f777148e-941d-4b66-b8a9-f4bfd7acd31c/17419487186.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/53363627338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7e9b26-24e1-477e-9af8-d6fbcc065389/60521780659.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/bijemog.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/waxisis.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_off00004a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A09 5252 bytes
SHA-256: 956e74bd075ebb568942300d77e742264f8fbd512d0fd360219da373f379c2cf
font_01_sfnt_off00005bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF1 9980 bytes
SHA-256: 675249f45dbf91b96bf41f72a47a2d7ed0aad09c79ea2d97743d1c071623a6b3