Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dbb2e8c1164f67…

MALICIOUS

PDF

34.4 KB Created: 2021-06-24 18:14:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 798a3d06eecee471f43a544b11b38a36 SHA-1: 1787a2b0aaf0562fbdcfa9ce214810f37acc3934 SHA-256: b5dbb2e8c1164f674c5654235cab0f6fa2fdd5cf50d95845c766f2bfb10bed2f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://netcdn.co/app/479516143/minecraft-windows-free-game-hack PDF link annotation
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/tiktok-free-2021-followers_GM835599320.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://www.st-leonards-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D9 21844 bytes
SHA-256: 27288fc821981f0d07d3529bc2c1602034c861b726602aeaba8cfecad1d370f0
font_01_sfnt_off0000630d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630D 18536 bytes
SHA-256: b4bed83de742f787c41c6ab2aa7bba014cf3bca35de08f281eda083b1c46b7b4

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