Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee548aad2d1e1328…

MALICIOUS

PDF

36.4 KB Created: 2021-06-27 05:28:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dc27c33e67b4b033b1e6ce2a3fa60d36 SHA-1: 3941f6940dab828716606801f71bdc2bae6892ac SHA-256: ee548aad2d1e1328d4df8343dab2864f9a782b5820e5f01a7064bd6cfad35036
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of 'game hacks' and 'free currency' to entice users into clicking embedded links. The primary link, http://netcdn.co/app/431946152/funny-hacks-on-roblox-game-hack, is identified as a redirector, suggesting it leads to malicious content or phishing sites. The ML classifier strongly flagged this PDF as malicious, supporting the observed lure and link-based attack pattern.

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/431946152/funny-hacks-on-roblox-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/get-free-robux-by-downloading-apps_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spin-coin_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-a-free-face-in-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-bee-hive-simulator-how-to-get-a-free-egg_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-gift-card-numbers_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-hak-2021-on-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-real-avatar-swords-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-followers-on-tiktok-for-free_GM835599320.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_off0000339b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x339B 23616 bytes
SHA-256: 40dbd0bf53c37497f0e90e33b2c8c2540cbaf8923e1e09db25700e83a59755dd
font_01_sfnt_off00006946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6946 19140 bytes
SHA-256: c5d2d44c456758290155ea804c5e4a86c658d4d35fb7f510230860154b28d149

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