Malicious PDF — malware analysis report

Static analysis result for SHA-256 27513b9d8307ac12…

MALICIOUS

PDF

32.5 KB Created: 2021-07-22 15:29:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ef50570903f0fc88659699c307000fb4 SHA-1: 6d33938ccf82705fee423d6d69dd3ec9600f509b SHA-256: 27513b9d8307ac1242562221a05853d27c8f60a1b0613da33aaf6aa2b2ea079d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering "free Robux" or "game hacks", a common lure for phishing and malware distribution. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent. The document likely serves as a lure to direct users to potentially malicious sites or to download further payloads.

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/free-robux-website-game-hack PDF link annotation
    • http://sfera-express.ru/images/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://sfera-express.ru/images/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://sfera-express.ru/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://sfera-express.ru/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://sfera-express.ru/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/earn-free-robux-for-roblox_GM431946152.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_off00002882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2882 22816 bytes
SHA-256: d97bc4bf8ac969648da15268c23b93feaa5153616f607c9f140ba16b87180ace
font_01_sfnt_off00005bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBC 18620 bytes
SHA-256: 1505002d6ea1bdfb5df8555ad3fb0955e96c48ae23d69b78f4b624628793cc75

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