Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8dcd57c5f7b275…

MALICIOUS

PDF

43.5 KB Created: 2021-06-10 21:26:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e0565d66fc11ce89f9246cb23abc34b5 SHA-1: dc384d498f1ebf3a878f4493671592475f2e7d50 SHA-256: dd8dcd57c5f7b2756285af6becd457608ec7e66a2f3774360ee199e95a4ab0eb
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 0.9865

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/431946152/1-step-to-get-free-robux-game-hack PDF link annotation
    • http://library.unissula.ac.id/fk/repository/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/tiktok-free-online-videos_GM835599320.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/spin-coin_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/50-free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/pokemon-go-free-storage-upgrade_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/pokmon-go-free-download-apk_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-hack-cydia_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_off00004f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F08 24316 bytes
SHA-256: cef09b9ef9ae776c4f3cca6696da5b59ad18bcbcabccda05d7523848dbce7963
font_01_sfnt_off000086ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86ED 18400 bytes
SHA-256: 1e7ca25780d9e58fbe6b1dd8f7fa30e668e1e71f3609a9c75193da946d6a159c

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