Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d61ed822774f3f5…

MALICIOUS

PDF

42.8 KB Created: 2021-05-19 00:33:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 196ff864da8a1100d82bc56f4faf8048 SHA-1: 00fb831aaa8c5ae3df2d07e6f7353e61df974a1f SHA-256: 4d61ed822774f3f55aff58faeb87a5f85696b8f30f84dd4825816440d695d3e5
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 0.9971

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.xyz/app/406889139/how-to-hack-coin-master-game-without-root-game-hack PDF link annotation
    • http://katalog.ireyogya.org/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-spins-coin-master-without-completing-offers_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_003_off00004ac8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC8 25388 bytes
SHA-256: d77f42db0d16a1ea3de0e1816854c4281c2c92afe53b3614a7d50d8460180fb4
font_01_sfnt_off00008400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8400 18644 bytes
SHA-256: 5b0b6c654ae884b7a351bf787d45d43166c87cb8727a18cb45f58fffc41445c6

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