Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c1f940e7df3fc2…

MALICIOUS

PDF

47.9 KB Created: 2021-06-03 10:41:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4e0b2c34b436ea670ca5a10db0f774d7 SHA-1: ac7e10c1d96d702bd739b33608f9b2bdbb815e2a SHA-256: 88c1f940e7df3fc236a757c05b238a05a45b8f930e69338cc11042fd4f55942f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document uses a fake CAPTCHA lure to trick users into clicking a link, likely to download a second-stage payload or visit a phishing site. The embedded URL points to a resource promising free game currency or hacks, a common social engineering tactic. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/how-to-buy-robux-for-free-game-hack PDF link annotation
    • http://pustaka-smpn3tpi.com/repository/i-need-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/grab-points-login_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/master-coin-free_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000521c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521C 26468 bytes
SHA-256: d153ff31b0ab1d32af6b8c820e3d4732c66383586ea33de6039b3dfccc502f37
font_01_sfnt_off00008e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E93 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9846 18356 bytes
SHA-256: 42cf6025b0828d48dcef6abba26d08473f6f67d2383591dd07323470bab2f866

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