Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c6d8b125e12ba2…

MALICIOUS

PDF

45.5 KB Created: 2021-06-08 22:01:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cd0aaf2febbb89220dd46de8eb20bd2f SHA-1: e781bde0c4a296a1a9972338c35d162f41a86cd9 SHA-256: c4c6d8b125e12ba27bd94832aaaf0ff25a000d2a25e98c1ff12baf530ffec7c3
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 0.9864

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/free-admin-for-every-game-on-roblox-game-hack PDF link annotation
    • http://pia2000.net/images/tiktok-free-college-books_GM835599320.pdfIn PDF document text
    • http://pia2000.net/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/robux-converter_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/how-to-change-values-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://pia2000.net/images/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://pia2000.net/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://pia2000.net/images/free-account-in-roblox-obc_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/minecraft-wurst_GM479516143.pdfIn PDF document text
    • http://pia2000.net/images/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005347.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5347 25904 bytes
SHA-256: b4e20ee3ce56526bd4268ae57044645133f7402ed9b128eb912c87b2bb008616
font_01_sfnt_off00008d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4D 19024 bytes
SHA-256: 512c681ccff161521d01c7865b9867bc1d1085f9462699f41568909ffe412748

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