Malicious PDF — malware analysis report

Static analysis result for SHA-256 4607a2bbc7569bfb…

MALICIOUS

PDF

46.0 KB Created: 2021-06-11 05:04:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1b5f170ae0a7d6da4f407d1b3c6ed710 SHA-1: adb8db4ed542459a807f442b62a55284330817bd SHA-256: 4607a2bbc7569bfb80a806a7944d59af16dc38c9cf6b759dddcd2e77e9cb5c5c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure and a password-protected-archive 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 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/download-roblox-free-for-android-game-hack PDF link annotation
    • http://projectunionstreet.com/library/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-games-like-roblox-for-chromebook_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/minecraft-free-edition_GM479516143.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/get-robux-for-free-2021_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
stream_004_off000052f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F4 26656 bytes
SHA-256: e7cc9f1b4a4a9fceadca9934f87f1c15b97a3150ed5882af10bbcb2a59c1d90e
font_01_sfnt_off00008f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F92 18804 bytes
SHA-256: da8ae9cce1f873031d2b5d890618d6f45fd3c1e8591c0246a79f335c25eb1048

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