Malicious PDF — malware analysis report

Static analysis result for SHA-256 76987631e4c31519…

MALICIOUS

PDF

40.7 KB Created: 2021-05-21 16:48:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 412aae71329d717efe1bce4d98710820 SHA-1: 6915dd98fe10db36b9b6d411ef6bdd74482ac841 SHA-256: 76987631e4c315199640e319c587cc207337b7383559f03f37150d5072d24c81
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple lures, including a fake CAPTCHA and a "Click here to download" button, to trick users into interacting with malicious links. The primary malicious link identified is https://netcdn.xyz/app/835599320/free-tiktok-coins-2021-game-hack, which is associated with a "free generator / game hack" lure. The document's content and heuristics suggest a social engineering attack aimed at driving users to potentially malicious websites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7508

Heuristics 6

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/free-tiktok-coins-2021-game-hack PDF link annotation
    • https://flyingchalks.com/ckfinder/userfiles/files/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-spins-on-coin-master-hack_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000374f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x374F 27392 bytes
SHA-256: c0421cc934b6e298b6127ee37904e477f50ab88cbf65346447d636ada02cedcf
font_01_sfnt_off000074fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74FE 2840 bytes
SHA-256: 0ff7203f6678b3ce5cadf82d8d4ab75daf80d11355a5b436446d16072593a6f7
font_02_sfnt_off00007eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB8 17860 bytes
SHA-256: 62157b557e0625fe7f4d28f443ac5124aa662715bc457b306d1c7ccf4ae45651

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