Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1e57b26eb0cbb8…

MALICIOUS

PDF

65.6 KB Created: 2020-11-14 02:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3bf1ff9fbe4cc83c28ac59a0ba8f3f69 SHA-1: 1d73884749d9126d56b15233e3e9aecf4d595d31 SHA-256: 8d1e57b26eb0cbb80357fc05b38e910432c31eecc39f88ae1cbf1c43e5775ea0
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://ggtraff.ru/123?utm_term=breaking+the+spanish+barrier+level+1+answer+key+pdf', is presented in a way that suggests it is a benign file download, but it redirects to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=breaking+the+spanish+barrier+level+1+answer+key+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5f96c830c60d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_5faf0e6c49180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5f98015dec603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5f9c7d7be07b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5f9d9ceee9f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5f93ecd792728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5fae23a3d70b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_5f9c1950710d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496374/normal_5fabed7a1b0a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_5faad3b95b1d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_5f9cd47b1cb54.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/419140b0-2751-4a9c-b869-8a1285eac636/tewirixaxorofegaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3ca1f8-f230-4f96-9443-cccf343655ea/nabusojevinafewax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/384d00ae-ca53-4080-be6c-1a3f3a26b997/jomavolorufegadej.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_off0000c25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25C 5860 bytes
SHA-256: 576487e1a5d0d3a32a93d3571de576ea585b7f8799d503b4318f0379fbd0316c
font_01_sfnt_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 10288 bytes
SHA-256: f32437073dcfb5b42c105872c2d83e36361907fe6252ba13e008d5b147c7d5ff

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