Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9af87ae86e82c9…

MALICIOUS

PDF

37.3 KB Created: 2021-05-23 11:05:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 68c47f7d4181372d1b264b4e81aef9f6 SHA-1: d700323b005d82a06387cf7db194b5e8e8dcb8a9 SHA-256: 3c9af87ae86e82c946bbb140e34dcc7997aad8c44138d75a70605eac82b0e2b0
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 0.9447

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-game-hack PDF link annotation
    • http://loszavera.com/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://loszavera.com/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://loszavera.com/images/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://loszavera.com/images/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://loszavera.com/images/free-robux-no-human-verification-generator_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_off000032d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D2 26844 bytes
SHA-256: dad9b1e2ed2f2b711bfa7758a73388c5a12fffa7f0ffa36849f4de7454bbc9d5
font_01_sfnt_off00007090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7090 18248 bytes
SHA-256: dc70545b78036d2d989a53e60713ee6b6ba72604799932bb5b2fc13357d7a02a

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