Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd68fa5a541a7b3…

MALICIOUS

PDF

39.1 KB Created: 2021-05-10 14:21:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bd830d25118644db3713a7d30fdf9406 SHA-1: bd985a18fac26c95ef344005dae116e8008f1a3f SHA-256: 7dd68fa5a541a7b3ccd3aaa37475ad232faa255a5f36cad32e853425521c981d
122 Risk Score

Malware Insights

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

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 0.9926

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/406889139/how-to-get-free-coins-and-spins-on-coin-master-game-hack PDF link annotation
    • http://zercalo.org/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-spins-on-coin-master-2021-iphone_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_003_off00003e1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3E1F 25220 bytes
SHA-256: d7b3254ce997498bc0f1beca016621b1d8ee02088c99e3375c3dfca421522f28
font_01_sfnt_off0000777f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777F 18224 bytes
SHA-256: 1cc62c3a0a16cdc45a8bfa34d4f93d18d6e17ba0d5398a0785b1875f29a446c9

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