Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6791cdb1af79dd…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 08:36:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 88688765614c85acb277c4c03029cccc SHA-1: 333ac64ddd069b154d132a9f64a0f753921a957c SHA-256: 8b6791cdb1af79dd482e8fa585a65955e82907855d345e9101a9d731c358b03c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure and a password-protected-archive 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 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/how-to-hack-roblox-accounts-passwords-game-hack PDF link annotation
    • http://librarysenior.com//repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/dailyrobux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/original-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-coins-link-2021-deutsch_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_off00003302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3302 22440 bytes
SHA-256: ad9141713ac9456af04d3f72919503b27199248b9e70ef7e121fbb8234b8dfb7
font_01_sfnt_off0000650f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650F 19392 bytes
SHA-256: 3c84ae6f9a5e0552a856930bec3990e9fbbab980911ed78a7ad20e22a995b826

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