Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b1af70a704b33a…

MALICIOUS

PDF

32.8 KB Created: 2021-07-19 13:52:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d48547023447e41ec7f449b21f65eef9 SHA-1: 88c0ad047ac084fac0483172667051be1c8d8160 SHA-256: c3b1af70a704b33ac2dacd63e3d7f38cf9de35082a373bf654dd8b4779a10dc8
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 0.9900

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 http://netcdn.tw/app/479516143/download-minecraft-free-hiapphere-game-hack PDF link annotation
    • http://www.torvet11.dk/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://www.torvet11.dk/images/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.torvet11.dk/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://www.torvet11.dk/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://www.torvet11.dk/images/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://www.torvet11.dk/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/minecraft-for-free-on-phone_GM479516143.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
font_00_sfnt_off00002cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC8 22092 bytes
SHA-256: 03ced3289a42adc92626a6a32319f4b9218cb43f5f3d0bfd66a4faed7f1db99a
font_01_sfnt_off00005d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D63 18632 bytes
SHA-256: d5148a3ebf6685d38fa7a82d6609f6f0baf7c57c3f299eff6d795086d297ed64

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