Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e9fa4fff07d3e0…

MALICIOUS

PDF

34.7 KB Created: 2021-06-22 09:58:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1c81b84df116d556d75436c9f591df08 SHA-1: 10df50435ab8a4d1074bd407d729aeaed4f97f4c SHA-256: 21e9fa4fff07d3e08de507eb8b1933da78557aa11e16659e305040bdc730a951
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.co/app/431946152/roblox-help-free-robux-game-hack PDF link annotation
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/easy-roblox-hacks-for-sword-art-online_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/earn-robux_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/rbxcommunity-com-free-robux_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://server1.elearningmansatuokit.sch.id/__statics/gudangsoal/files/roblox-arsenal-hack_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
font_00_sfnt_off00003282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3282 21924 bytes
SHA-256: 2fc353e12a1157715fdd8bcef71e0ed583b0764b6a9778dfec20c2b126e1ffb3
font_01_sfnt_off000062d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D9 18968 bytes
SHA-256: e6d3133e218776b7d87035f377c26f4245cc7a54287827524eb781a63c565006

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