Malicious PDF — malware analysis report

Static analysis result for SHA-256 4551d0e57e90b3eb…

MALICIOUS

PDF

46.2 KB Created: 2021-06-09 09:06:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dcac4f34637cc84bb9c985337895c303 SHA-1: d6020f3b91b70457567e135a289e6c56936467ac SHA-256: 4551d0e57e90b3eb512743793a7d1989399d88307abb9309811f8f25ac68cfb4
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 0.9864

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.tw/app/431946152/roblox-username-change-free-game-hack PDF link annotation
    • http://slim.sisminkada.net/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000525e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525E 26932 bytes
SHA-256: 8bafcadbe012370a392f7cc757a6ba9c36aa160ec62c3f841035b5ccd53710a8
font_01_sfnt_off00008fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE5 19076 bytes
SHA-256: f29e04222e97e4e21b82a8982b677645499fce2796f2bf13473ec9975b1cd6e5

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