Malicious PDF — malware analysis report

Static analysis result for SHA-256 e427debe06b52e45…

MALICIOUS

PDF

77.5 KB Created: 2021-01-01 02:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 645dabf9acd002cc2a961b1500dbb12b SHA-1: efaf4e90218124d063755da7a13f9913a6732fb0 SHA-256: e427debe06b52e45897fd2638dadcabc6692e92b83f79e73adfcd2875072a755
154 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/'. This URL is likely used to lure users to a malicious site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious URL is sufficient to infer a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=how+to+calculate+energy+conversion+efficiency+for+ecosystem+trophic+levels In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_5fa20695e30da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_5f94866aed9f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_5f979061aa2ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5f9e4051933fe.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/czsmogf/anjing_intelligent_pulse_repair_charger.pdfIn PDF document text
    • https://cdn.sqhk.co/forokuxodel/GjhxJb4/folulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fdc408ddb1ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483081/normal_5fc571ed9cdbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5fbc5ef9b7021.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/8005720e-5539-4dbe-abcf-c07a7927434f/living_environment_regents_june_2016_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95803738-c2df-4f7f-b593-8569cb75d9cd/13118211138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f405ce-63f8-402e-82f3-0d6647f5b3ca/navitas_cacao_powder_24_oz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36074b57-76f0-402d-9786-13a187322021/the_death_and_return_of_superman_2019_full_movie.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_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 5644 bytes
SHA-256: f42be735a96ed9fb0c225810c0e186b99a57ce9bf9f92725582a5b8dbe4f9068
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 10240 bytes
SHA-256: 74db5fe4ba2563023a90abc03223410187fa17647af7ccfe2c428e822dd088df

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