Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a550da4ef6f6914…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 22:32:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 44ca2d32895af2bb311bd690492faf6e SHA-1: dc8d11944c7bdd8628dcd991a760dad86974b2ab SHA-256: 5a550da4ef6f6914efb05f9b0a3dfd00dd8b62b1e65d0ae49b119f77b4c8daf3
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/free-robux-no-human-verification-or-survey-game-hack PDF link annotation
    • https://selesindihome.com/ckfinder/userfiles/files/how-to-get-free-robux-and-tix-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/roblox-rust-free_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/roblox-knife-simulatore-hack_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/free-robux-inspect-element-2021_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/roblox-speed-race-hacks_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/fake-robux-codes_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/how-to-play-paid-acess-roblox-games-free_GM431946152.pdfIn PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/how-do-i-get-minecraft-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
font_00_sfnt_off0000329f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x329F 22320 bytes
SHA-256: ad6e4e71dc39e0187a51851286d9b21c8c91707799f2b7e886ce0c89f0d97025
font_01_sfnt_off0000641e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641E 19628 bytes
SHA-256: cb05efb9b877c2f5ac358f74233e4765df12f9300101f4d7656cf4ee8e1f887a

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