Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c81220fc060b30…

MALICIOUS

PDF

38.5 KB Created: 2021-05-23 08:43:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2c956bc621ff640eb3337bc579ff5091 SHA-1: e750211d2b513f15920c8231efcf1c4d40c8acd5 SHA-256: 38c81220fc060b30f1994121c435d0d3e48bd1d7e2ccf166bd8df2119496798b
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 0.9476

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/free-robux-no-verification-no-survey-game-hack PDF link annotation
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-robux-accounts-2021_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_off000035dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35DD 26792 bytes
SHA-256: 1bc01550e30531381c17e263ae9d24df77ef742ec34f848382ac54e7d3153b09
font_01_sfnt_off00007356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7356 18892 bytes
SHA-256: 71091a6cc5ee2467f7d55b23aad8276d14a961c51a29e0f15aa3bcc69cbd56da

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