Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a2f840467c701d…

MALICIOUS

PDF

67.0 KB Created: 2020-12-23 03:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f89141821a9b22d8ad4347d3ca96786f SHA-1: 71410fef4486279eda51a849839481ea8441e59d SHA-256: b0a2f840467c701d7586232ab56a1924e271309342c027be6c6cfb1295b3382d
154 Risk Score

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 'https://cctraff.ru/strik?utm_term=counter+snipe+mod+apk'. The document body, though heavily obfuscated, contains text that appears to be a lure for a modified APK file. The ML classifier also flagged this PDF with a high probability of being malicious.

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?utm_term=counter+snipe+mod+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_5f96c3844fc35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386595/normal_5f9f21aca7060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5f8f327de775f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fb4cff1c7f6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fc62dcedd1d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_5fc8de84befa0.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/zomuzigo/new_addons_for_android_box_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db6cb26-13dd-4781-88c7-09ddcb7d9c05/50299314286.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/vedatugo.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/supoled.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/thailand_bangkok_tourism_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/good_morning_photos_for_whatsapp.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/acknowledge_receipt_of_cash_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1632c1cb-2da7-4b0e-ad2e-5c2a6d6a92ac/51617175739.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_off0000c6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E2 5044 bytes
SHA-256: 44798db039263f1add3855fd50e309220f9e0522d1a1bb79a956411681688e4a
font_01_sfnt_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 11096 bytes
SHA-256: d839ba9f33ceb44b7172caa82d240c8cb7497647620c8f29303eb6057d89f549

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