Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b0916486b5af56…

MALICIOUS

PDF

46.3 KB Created: 2021-06-11 09:38:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fae5ad25a061087b3d54c75e5ff42654 SHA-1: da9e6b78cd4817fbb3f1dfc11048bbf2a4bb7af6 SHA-256: 77b0916486b5af56fd499591f23f11a7e110888489adf962c134d7fa7fa05623
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9832

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/how-to-advance-roblox-hair-for-free-game-hack PDF link annotation
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/rbx-earn_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/free-robux-online-generator_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/coin-master-hack-mobile_GM406889139.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_004_off00005312.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5312 27268 bytes
SHA-256: a173ed8418dd90ab26843d544fabe44a48b5c702dea33232c4f1c5664685694f
font_01_sfnt_off00009140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9140 18748 bytes
SHA-256: b3cde9b5b37add24a74ad881e7e5664933e583dec673521e24b738f3b8b5b58d

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