Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcf849bc71c9000…

MALICIOUS

PDF

46.8 KB Created: 2021-06-11 00:21:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5a7f77c3c4254d559e31146bec12b6e8 SHA-1: 976424447e51e4ca15ee4757cf65d12bf13a8fef SHA-256: 6bcf849bc71c9000bcf4605982defd3de4733ce91d4bc24e65958eacfc9affd1
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 0.9832

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/hack-for-free-robux-2021-game-hack PDF link annotation
    • https://pustaka.widyakartika.ac.id/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/rbx-free_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/pokemon-go-free-joystick_GM1094591345.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-tips_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-get-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.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_off00005220.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5220 27592 bytes
SHA-256: f0c962b6821f39ce62731c562ed320e5ffd4dbccd7cd19f50182cd416f1fad86
font_01_sfnt_off000092cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92CF 18816 bytes
SHA-256: c28f5736609a4585a3d1bb0fdfd3b07528e7c5571ea543f0ca4cdeaa7fecd051

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