Malicious PDF — malware analysis report

Static analysis result for SHA-256 99add4d2275c9889…

MALICIOUS

PDF

33.5 KB Created: 2021-07-03 11:54:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4b90bd91348e2c88104a6a36594fd6cf SHA-1: 2b75a6c1b2b0f017e71041b51198e5ab1840e7ce SHA-256: 99add4d2275c98897896355783ec0d460198ec0cbcc0fa6a5278788056d461d7
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.tw/app/431946152/roblox-apk-hack-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-cc-hacks_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-download-free-chrome_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/easy-robux-today-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-cheat-codes-for-robux-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-hack-assassin-roblox-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hpw-to-hack-roblox-android-step-by-step_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-link-app_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/como-hackear-la-cuenta-de-alguien-en-roblox-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/rbx-sites_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-games-on-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
font_00_sfnt_off00002d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D17 22096 bytes
SHA-256: c4bdaf1e4643e91accc262d3dbbb084548f91245f51f2914bcf20d7134610f01
font_01_sfnt_off00005e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E29 18832 bytes
SHA-256: 4a54e3c0999d22341ed87b7a4ab614cdfd6f3715e6a9eb51b324e9e7408846b1

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