Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63cd2a7d30b76b3…

MALICIOUS

PDF

44.8 KB Created: 2021-05-17 16:03:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c5132e1f87dc5aaf667a8a6ed0aec323 SHA-1: 4374b32d09d5aec7837b7e2dc56e6c5e25fd7208 SHA-256: f63cd2a7d30b76b35475b827a5c0d41b52db96dd23e852ee98e77d313b87b846
90 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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/431946152/lazyblocks-com-free-robux-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-coins_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/earn-robux-online_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-avatar-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/moon-active-games_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.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_003_off00004ba0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA0 28860 bytes
SHA-256: 570d60624772f22a1516e6b8003d1a4b613f4e083f023105261c7cf0ba4995aa
font_01_sfnt_off00008ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB3 19008 bytes
SHA-256: 000d85757c2dbc774c4a4ed19607b9025a632ba167ee8131c5b8e6d7f50f0f1c

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