Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c774a0d9c63e55…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 01:10:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 724d36d1e12a0121915ec294cb92b932 SHA-1: 08eaa0abdc36aa275daa4e87596afc517cf5ff2b SHA-256: 94c774a0d9c63e55b6deebd4b53821ba5beca404b423f0a451ffb187ed1f9545
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 0.9865

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-get-100-robux-for-free-game-hack PDF link annotation
    • http://reisebild.eu/images/roblox-admin-hacks-name_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/free-stuff-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://reisebild.eu/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/how-to-get-free-stuff-on-roblox-ipad_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/free-robux-reward-sites_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/online-hacking-tricks-coin-master_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_off00004ef9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EF9 26584 bytes
SHA-256: 6f14e673ddc29e4c949b49741e94130e9b52753c5e1a3b2c13acd70d6cf86f59
font_01_sfnt_off00008a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A51 18560 bytes
SHA-256: ebe7febd7c9c87dba90e20cfb7f210acfd9bc8f8383e28ef55b41a5f3c0fccc9

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