Malicious PDF — malware analysis report

Static analysis result for SHA-256 1427ff67c29c6e4f…

MALICIOUS

PDF

34.2 KB Created: 2021-05-24 06:45:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 92a46935e362ef605a6c82d20149d6aa SHA-1: 4912caa666f6a95fb2db43a33229ac0c21f057ea SHA-256: 1427ff67c29c6e4fc26928f910340f24ed74dcc690aac6071e900b88e95ceff2
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9508

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/835599320/free-tiktok-app-game-hack PDF link annotation
    • https://www.manmed.info:443/images/freer-tiktok_GM835599320.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-daily-free-spins-link-2021_GM406889139.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_off0000307e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x307E 23548 bytes
SHA-256: 34894a99e006db3e1a037e404f3a362bc0f83a59b90bd4de59593fc1dda11885
font_01_sfnt_off000065ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65FF 17632 bytes
SHA-256: ea608747ff9a73a218f7ff90867c843845867270d7f940ccd5b7614aaec9a371

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