Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bce4e3936780855…

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 01:49:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 40910a19f6997863bed9f46021bae40a SHA-1: 0de03913e3bde4f304d955a3414a11ba1dd467f9 SHA-256: 4bce4e39367808551e7c1385da8c8b0d1c85428f8d2da81e27ec1fcc0ffbe470
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 4

  • 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.
  • 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/835599320/is-tiktok-free-game-hack PDF link annotation
    • http://fobh.net/userfiles/files/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-cheat-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/robux-get-com_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/rbx-boots-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/i-need-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/video-roblox-free-robux-with-promo-codes-2021-august_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-android_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_off00002eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB8 22724 bytes
SHA-256: 23022d1a39dbc26315791ddf345f0bbf8c45532a87403594af67bc10a9f38dcb
font_01_sfnt_off00006147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6147 17972 bytes
SHA-256: 1ad9b968f8d868dc9306eb656e42f80411177ac895833eed5c4e9bc3c7375aa9

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