Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85048fe9142cd2d…

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 07:36:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a639dcd4a193bc384027fb2a0eac8880 SHA-1: a9d13778ea77965836d75a5d496cfdfd1ac18cd8 SHA-256: c85048fe9142cd2d9fcf49495e7d10e639f51d3b4b36b07aeaa8c857335eb5be
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/free-roblox-account-with-ultimate-driving-cars-game-hack PDF link annotation
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/wurst-115_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-can-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/como-conseguir-roblox-badges-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-giveaway-live-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/cheat-for-dinosour-simulator-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/get-robux-now_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-mod-apk-2021_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
stream_004_off000052b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B2 24648 bytes
SHA-256: 66842511c001f2289bfd7f1b0092e36cfdbd062871ca150b34ac36ce1bda72ef
font_01_sfnt_off00008af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF4 19920 bytes
SHA-256: f6c133161ecd149a28d1191d525211266ff63430bd54fd1a59033c59931d68bf

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