Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ce5d70758c3d7d…

MALICIOUS

PDF

46.2 KB Created: 2021-06-09 05:33:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e8576e424a0daa0faaf912ce00903db3 SHA-1: bd1320d1dfac72d572addac9d9547799b9d8dcc4 SHA-256: 14ce5d70758c3d7de9c39bec40ce31cecee52a324cf2e9f16028932d7105fd0f
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 0.9832

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/how-to-get-roblox-clothes-free-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-hack-script-ragdoll_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-free-app_GM479516143.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
stream_004_off00004fdb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDB 28748 bytes
SHA-256: 6f675027746f803c8b7c14333a6dd0a0276dffbf5a03901c9444bc7ff13973f6
font_01_sfnt_off00009200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9200 18384 bytes
SHA-256: f499fe8cef3ca77379e6f20ebf3fa7b53640c57369361a3ea74493ab17a56294

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