Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b787ff5d806b2c…

MALICIOUS

PDF

46.6 KB Created: 2021-05-12 17:48:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 49dec99fae97b17a298b6df0cd4cf757 SHA-1: 8c92ba8ff7b515a74c6d6c588491e5866eccd016 SHA-256: 99b787ff5d806b2c6346fb74cc2f1eed37affc019d7f0966ce905c9a3bf8aba9
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 0.8948

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/ways-to-get-free-robux-game-hack PDF link annotation
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/robux-sites_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/robux-game_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a03.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A03 26316 bytes
SHA-256: 8826c440245d92c9bc95e3851be2602950f787fd9a81f18d97fa4e89df6b6edd
font_01_sfnt_off000087e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87E1 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off0000920d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x920D 18724 bytes
SHA-256: b2cd5ec598a8c260812e966e9710fb38f03066217a6d0ec8f431d8a9dca8af42

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