Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf90f776829a3753…

MALICIOUS

PDF

82.3 KB Created: 2020-11-18 16:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c1525f60c83d925645f9c7ed75f93544 SHA-1: 69461446053c0321f2e69b2476d384021f74cccd SHA-256: cf90f776829a3753b26320105e0c4615f3411ed2a2d13ceb30274c1a2c023905
162 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/123?utm_term=cash+budget+example+questions+and+answers'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The embedded URL is likely intended to lead the user to a phishing page or a download for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=cash+budget+example+questions+and+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_5f8f5aafc1c17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_5fb4821d03127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5f8d6771788e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/38681445-12a4-4576-9b83-8485197e389b/tosinebab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3608c5b7-1118-4e5c-926a-c7ae922d920d/95556548292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85580d14-a3ca-4883-a9fa-3e13d9b9be6b/82845685308.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/35073974152.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/84030978153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28548eaa-1651-4d93-82be-a55116492f09/mejenojutejanuviguwoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef943510-b78d-4746-b75d-7cbae8e3a715/20122193746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319784f1-3042-4468-845f-e4f6324cc99f/laresufuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2eb675f-cbcb-40b2-9b45-37ca378ebcc5/sogozotove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86be9927-79c1-4676-a8eb-ce4e84dca99a/vulimosupefozowawe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 5704 bytes
SHA-256: c9ef4bf7872a1049a84302dfcc2caa4fcc0c6e3969167c4569cc559c1593d890
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 11340 bytes
SHA-256: b6a9ad1f986278193c6b56e2757268a31f3289c18a429fa14bc34fffa2e520ef
font_02_sfnt_off00012e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E26 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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