Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4990ad3b013633…

MALICIOUS

PDF

41.5 KB Created: 2021-05-10 14:44:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cfc0cfc3d1449225848e1ef37dc8c2b8 SHA-1: df83fd804afa2f5ceabe4b24977d27d373225946 SHA-256: 1b4990ad3b013633453e5bb3786ee418a94100c89617cf2b35dda7d6448a5f7a
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 0.9826

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 https://netcdn.xyz/app/406889139/40-free-spins-coin-master-game-hack PDF link annotation
    • http://learningarabic.co.uk/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003c60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3C60 25416 bytes
SHA-256: 4ad9f038ac475ec3c100fdb26e47f8be741e0b836ef7901f7af46cb8dd3f4323
font_01_sfnt_off0000763f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x763F 18120 bytes
SHA-256: adc3b494d1fa0974f6acdf3c8a88f4cec1eca3c3c07b4c24b7a089c53791e33f
font_02_sfnt_off000097cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97CC 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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