Malicious PDF — malware analysis report

Static analysis result for SHA-256 1feb61db79827ea6…

MALICIOUS

PDF

42.8 KB Created: 2021-05-15 14:18:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 936627637f4b24baaad15af6186fb008 SHA-1: 6c568db24a6c3d016d2bf427c6e7d68e89978384 SHA-256: 1feb61db79827ea69c750b478100a847eae7478a2bf873e1d083f63a5655fc53
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/431946152/free-robux-no-verification-required-game-hack PDF link annotation
    • https://razredna-nastava.net/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/get-free-robux-today_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_003_off00004974.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4974 24868 bytes
SHA-256: e10e4aac510e5d3c8f048a9feb637a87a0c5f463e0deb84686dfdde43710e228
font_01_sfnt_off000082c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C7 18944 bytes
SHA-256: 3e075e77f873d88a985ea69ac7fafb934745d76ebabdb09bc56e33f005972947

Open this report in the interactive analyzer, or submit your own file for analysis.