Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9605934830dc0e…

MALICIOUS

PDF

33.4 KB Created: 2021-07-06 13:13:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0b9a0c78f3f922c65a211dcb8b5989d2 SHA-1: 794d6d38dc70f9048a80c395164407883dc16e8b SHA-256: fc9605934830dc0e5154afa0f22629e0ca530638ace33665a0b567a6042fac6b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "Roblox game hack" and "Robux generator", directing users to the URL http://netcdn.tw/app/431946152/claim-roblox-game-hack. This URL is likely part of a phishing or scam campaign designed to trick users into visiting a malicious site. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/claim-roblox-game-hack PDF link annotation
    • https://edu.kyst.com.tw/image/data/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/comment-hacker-robloxe-facilement-sur-pc-2021-en-francais_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-casterly-rock-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/why-do-my-roblox-hacks-crash_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-hack-how-to-get-ultimate-trolling-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/mobile4free24com-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/play-roblox-hacked-version_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-hack-in-one-go_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-hack-use_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/best-hacker-ever-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-candy-van-script-roblox-pastebin_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_off00002b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B0F 22824 bytes
SHA-256: 9fc56ffe7c5b6785c17f570f187ad5c95aab6dfc7beda4e988400615b833753d
font_01_sfnt_off00005e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7C 18864 bytes
SHA-256: d70b750096d3c59baf5f0f0ea3863712f8ab6b73e17a22a6786d3f342d6747ec

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