Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd134ecc977be8f…

MALICIOUS

PDF

52.0 KB Created: 2021-06-03 06:18:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 044f66b395addc3707065f812d934bfa SHA-1: 15993bc24b0e8bbc3f0af9bdc87e938c3e67abb7 SHA-256: 1dd134ecc977be8f0057dba386e00d728d310a9cc09bdfcb9cfdb3915edb43d8
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 0.9464

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.online/app/431946152/free-robux-generator-no-human-verification-or-surveys-game-hack PDF link annotation
    • http://library.smpn2-byl.sch.id//repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/pubg-uc-icon_GM1330123889.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E6 33576 bytes
SHA-256: 4b8587ae90dc77a86b9bbad4f53575170859a6149b00181d3b4167c349bffa90
font_01_sfnt_off00009c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C56 2844 bytes
SHA-256: d4efd49219a7ff6424c923a6ccef5b7e1750ded18bbd79546f2ad196ddc76c43
font_02_sfnt_off0000a616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA616 19156 bytes
SHA-256: b23a4dbd5b2cf0eeb4dbb5626642de4de2979fce29ecd3df28c5d1ef95471ce4

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