Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e63b4da711b636…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 07:12:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4a45a8c017f4ca1cf60d4c57b3c0eea2 SHA-1: 65884afedf8cfe531178d16c01e67704080fada0 SHA-256: 66e63b4da711b63636b022eac7181cd4a2b55d0cb6b4ec9fd5d552d6c6fea3b7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to sites promising game hacks and free currency, such as 'coinmaster-links-game-hack'. This indicates a social engineering lure designed to trick users into visiting potentially malicious websites. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or scam attempt.

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.tw/app/406889139/coinmaster-links-game-hack PDF link annotation
    • http://pustaka.smpmuh2yk.sch.id//repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/roblox-adopt-me-free_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/how-to-get-free-hair-in-roblox_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
stream_002_off00003158.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3158 23200 bytes
SHA-256: 819b62ed8a3c785bad78430ffb5f7da9a1b7ced96ecaff2fbf442627bcdf1b72
font_01_sfnt_off000065bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BC 18264 bytes
SHA-256: cd2d4d9d379a8916250aac1c40b30da442fa59c9e5313384739df103290c40c0

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