Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f3cb5513156e75…

MALICIOUS

PDF

38.4 KB Created: 2020-11-04 08:11:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: dad97787eeb0f4b6980b1eba9073d8ec SHA-1: 964dfec2300389b42dd81b0cd71b50d652728dee SHA-256: d0f3cb5513156e75da545d7f72688814064607ba119559478ca487ecbabeba19
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to lure users into clicking it. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=chapter+4+mastering+biology+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_5f977f18e8066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f8b6753da7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5fa1e0073fd7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5f9660459a42d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f995db7eb3bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f8fab9007d58.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/gosete/20000811951.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/honeywell_timer_switch_programming.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/fillmore_charlotte_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/xinipijamu.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/caia_level_1_sample_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/lipids_worksheet_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/aprilaire_600m_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/my_wave_guitar_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/deep_convolutional_generative_adversarial_networks.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_off00005551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5551 5560 bytes
SHA-256: d2e0a574faff471d8ee07335b35d67837322d1bdfd97b8de0c5f4abb751d6af8
font_01_sfnt_off00006826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6826 10804 bytes
SHA-256: db5043360eecaf5cf0acfd5648accdafaa458b43df482645870b4fd70a8284e5

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