Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b640b3a8cd1401…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 16:02:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 13160e2351015bb7fe12602619fc827f SHA-1: 83fdb33aaf6246e552e53734580fb23db29e49df SHA-256: 62b640b3a8cd1401d4754c5bc2679ffdd0e6cb5ba987d38a6f0679d701065a70
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 0.9980

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 http://netcdn.tw/app/431946152/free-robux-legit-game-hack PDF link annotation
    • https://fib.ub.ac.id/sac/repository/roblox-browser-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-btools-hack-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-codes-2021-live_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-tool-online-no-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-bc-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/www-coinmaster_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-gift-card-26-11-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-dominus-userscript-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/notepad-hack-roblox-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-free-robux-with-offers_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-script-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/booga-booga-hack-roblox-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spin-coin-master-online_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
font_00_sfnt_off0000301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x301E 21984 bytes
SHA-256: 8c9ba4ed5d71edf8c9ecb028612d518ac89186c2cb3e0b6563be37540124828c
font_01_sfnt_off000060ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CA 18940 bytes
SHA-256: 794d8ecd233df1702e9bde6a16c5f654292374bf49d8c1531efb1b5eb25ac7e0

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