Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71b93348426f736…

MALICIOUS

PDF

33.8 KB Created: 2021-07-21 14:33:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 12aa2b885e112a40cf19e71c0ab30ca9 SHA-1: 1c27e3b74e44d5e71f777f2ec79027148328ba80 SHA-256: c71b93348426f736557afcefd14725e8ef137856de5f904e34bf54e022edf2ee
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'Coin Master Free Spins' and directs users to a URL that is flagged as a game hack redirector. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to lead users to a phishing site or a download of further malicious content. No scripts were extracted, but the document's structure and embedded links strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.tw/app/406889139/coin-master-free-spins-link-today-new-game-hack PDF link annotation
    • http://www.akvamaster.com.ua/images/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/freer-tiktok_GM835599320.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/free-spins-coins-coin-master_GM406889139.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
stream_002_off00002ccf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CCF 23192 bytes
SHA-256: 752fa430ea7c825c01afeeb3cefb83d58bbeba37f1530c142ff294e0ec9f0d98
font_01_sfnt_off0000611a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611A 18572 bytes
SHA-256: 51c95658009ee6a6ae875a8d4133a79c51d36fbd34bac1203a2f2fe060da7c96

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