Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e99f1c58e307f60…

MALICIOUS

PDF

37.1 KB Created: 2021-05-25 07:30:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9260ff80767ff1a92bb4755eb7bf5617 SHA-1: 33589c338b1856a63d15fc078aad92d5d154b6aa SHA-256: 1e99f1c58e307f608e5c23783ed627c0209d6efc19f1943d226bb6a82f2e6bda
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for a 'Robux Hack' and presents a fake CAPTCHA to trick users into clicking a link. This link, 'https://netcdn.xyz/app/431946152/robux-hack-2021-game-hack', likely leads to a malicious website designed to exploit users. The document also contains multiple embedded URLs pointing to similar scam pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/robux-hack-2021-game-hack PDF link annotation
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/how-to-get-free-robux-on-phone_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
stream_002_off000032cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32CF 26244 bytes
SHA-256: 665f08fc7c28af2322e6f4a85148adbc2a83fcbad28c76d39c35feff9ff810ca
font_01_sfnt_off00006e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E70 18648 bytes
SHA-256: 960613bb0fa4c19a2503237e067522a4d484b1b5f3e7387dbdf2c2d9282ca05f

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