Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d0e115f63ae9fd…

MALICIOUS

PDF

35.0 KB Created: 2021-06-20 00:27:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f5b7e91f4c9bbaee7d3ca7556fe2a919 SHA-1: 8a132990bef2cdf2a34619014af8816903b22f15 SHA-256: 21d0e115f63ae9fd0d3e07feb2fbc4bae72c40236ed6d791a245d2e52ce2defe
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.co/app/406889139/how-to-get-free-coins-in-mcpe-master-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/tiktok-free-like-2021_GM835599320.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/games-for-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-et-free-robux-april-2021-pc_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/hacks-for-build-a-boat-for-treasure-roblox-infinite-blocks_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-t-shirt-to-create-a-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/robuxglobalcom_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/withdraw-robux_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
stream_002_off00003306.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3306 22876 bytes
SHA-256: 7a3097ae2afe1b10e4304a2cc50f51c8f0a46f18471fb0955b5724ebf772864a
font_01_sfnt_off0000663d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663D 18336 bytes
SHA-256: 429c8df05e4b8cc7b4d833e2e7b4429a19a92e68eadf29af331a617609675059

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