Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa399be643ee5fc…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 04:52:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 98ed1c08f148b60b0349e73ba26ac81b SHA-1: e2c738e322c28a7cc86bc122540f71757840b4c1 SHA-256: 5aa399be643ee5fcc399cdc278d4b0388231d2158c180474ad080132f89b6c9e
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 0.9826

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.online/app/431946152/www-free-robux-game-hack PDF link annotation
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-tiktok-app_GM835599320.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_off0000507d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507D 25388 bytes
SHA-256: 48163ded17391de1f90e74c4b06de0bccbb8965e7f697181dbb004f7429db842
font_01_sfnt_off00008b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1F 2888 bytes
SHA-256: 3336a466fcb64b720a3988844ebe6e938788f23c31f568cd9aeb6f9b1346142d
font_02_sfnt_off000094f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94F1 18376 bytes
SHA-256: 3afa3067d1f3c9d8d4e5028784d7d2a7352a3b977a914758f486701e4d265e0a

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