Malicious PDF — malware analysis report

Static analysis result for SHA-256 91595ea98e63d378…

MALICIOUS

PDF

33.0 KB Created: 2021-07-20 20:37:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7191b1dae23e28fdb7ea3e4e17d8c26a SHA-1: a92cebc6034fae87a7fea836c43292171f322227 SHA-256: 91595ea98e63d3780d54d7518d5c5e1e52f2afd611c20b48917a2a4d2a37df51
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 0.9900

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 http://netcdn.tw/app/431946152/earn-free-robux-for-roblox-game-hack PDF link annotation
    • http://akademiatenisa.org/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://akademiatenisa.org/images/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://akademiatenisa.org/images/robux-free-c_GM431946152.pdfIn PDF document text
    • http://akademiatenisa.org/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://akademiatenisa.org/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://akademiatenisa.org/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://akademiatenisa.org/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://akademiatenisa.org/images/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://akademiatenisa.org/images/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://akademiatenisa.org/images/buy-tiktok-followers-free_GM835599320.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
font_00_sfnt_off00002b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B8E 22676 bytes
SHA-256: 548e99c1b14a3769df327265ad2f0d97d81b6a9985ed6b15584323e4d24bcc11
font_01_sfnt_off00005e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E79 18504 bytes
SHA-256: ff3c46e153643819b6f5f78252fa4224f2b94fd95d76ee426fe9153007a53f2c

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