Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecddaa3ee3912820…

MALICIOUS

PDF

66.9 KB Created: 2020-11-10 10:27:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 57f6e1ca4f451b09c2e79a316a0a3d91 SHA-1: bda8bfc8d9e3e45fe9b50c7b651aef18194d6a9c SHA-256: ecddaa3ee3912820955684e007f01823942bd0bf6b7a210fee123de9bf75ee12
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically pointing to 'cctraff.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely serving as a phishing lure or a distribution point for further payloads.

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/strik?keyword=charter+communications+spectrum+email In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5f8e2a34484b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_5f97181c3c261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f973ea4d728b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5f9a22ae70fc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f8abd8e1abb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_5fa2650581a7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_5f98a0638a284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_5f96f6b45b279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f8d161fb6fae.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/95b4545a-144e-4666-bf69-8b6b7d494647/58258401334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/551fc7ba-ec1b-49a0-9da6-da54052aa8c6/wonore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e500c0-ac84-412f-8444-2a70d2bcf21c/graphing_trig_functions_worksheet_doc.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_off0000c7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A1 5076 bytes
SHA-256: c8ce48ce7d5b1b94e855b89ac1994b3f15c13cae5502c55557c856d3e394b38f
font_01_sfnt_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 11068 bytes
SHA-256: ea98723a819a064e5cc10d57676400c77b827de041773a24db80eb8d45d1da83

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