Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0b3b1bf0e0b131…

MALICIOUS

PDF

48.5 KB Created: 2021-06-08 21:08:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 91d2357061ab0ea65dbe38c5d0f6fd18 SHA-1: ef5ca99be121bf33fed9df2c12ef67e0fd0e4293 SHA-256: 1f0b3b1bf0e0b1319045ef63f7a97d73b3f1fe014b815e345b1c077e6a32273a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9796

Heuristics 4

  • 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.
  • 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/roblox-free-sign-game-hack PDF link annotation
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/pubg-2021-uc-glitch_GM1330123889.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-spins-link-2021-iphone_GM406889139.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_off000052fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52FD 26504 bytes
SHA-256: 30e4dc86038fadd7832818924928a215b1f42ccec3d717f3fd3601ff4890bf82
font_01_sfnt_off00008d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D80 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A91 18356 bytes
SHA-256: d8712245762b7febc670909bef61fddde30c42e0a5e8fc866b166fd6e0cc718f

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