Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c11666773316c4…

MALICIOUS

PDF

51.8 KB Created: 2021-06-09 15:34:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dfe919599daf64c4c36f6ca4f8097777 SHA-1: 6749c94e0b039b7b53612289a5ebe063e9fe99f0 SHA-256: 76c11666773316c4e84c8e5bf389c9fe6fe161b63405a09dcbf86693e48e083c
122 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free Robux' and presents a fake CAPTCHA to trick the user into interacting with a malicious link. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-robux-no-information-needed-game-hack, which is likely used to deliver a secondary payload or redirect to a phishing site. No scripts were extracted, but the presence of a fake CAPTCHA and a direct link to a game hack generator strongly suggests a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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/free-robux-no-information-needed-game-hack PDF link annotation
    • http://opac.fuf.uin-alauddin.ac.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-get-free-bucks-in-adopt-me-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/robux-de-com-hack_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/roblox-jailbreak-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/roblox-gift-card-codes-free-unused_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-hack-dino-hunter-roblox_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_004_off00005404.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5404 36476 bytes
SHA-256: 3c894f64486ca64a4f0b0c4f449b40db1eb82d956cc912c3ec286b26e3f36a99
font_01_sfnt_off0000a69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA69D 18900 bytes
SHA-256: 4142ca7e42724c4520f22026cbdb53dc8eba1d93921235350b504ef825380469

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