Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9fe7c826340ffc…

MALICIOUS

PDF

44.6 KB Created: 2021-06-08 14:23:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aad02883962b8d7ec1bdda1f4fcf224f SHA-1: 8921419e88eb3f2c8623ea1ff381351deb86e7b4 SHA-256: 8a9fe7c826340ffc34ba32845c7d81236b1e06116ec557659cf88f43c2de8edc
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 0.9865

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.tw/app/431946152/roblox-hacks-for-mac-game-hack PDF link annotation
    • http://www.kcmconsulting.com.au/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/free-tiktok-app_GM835599320.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/earn-rbx_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/free-minecraft-coloring-pages_GM479516143.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_off000050ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50CA 25096 bytes
SHA-256: 8822d19b91160a1aab7546849af169567f6e5f88f25de96b9e36d05d68109a54
font_01_sfnt_off00008ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE3 18544 bytes
SHA-256: b54d427420c2b6acb67d73efd488d39bfb4939947f3518d8bf7854551a24b695

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