Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d04bafe56bb10b…

MALICIOUS

PDF

38.0 KB Created: 2021-05-23 08:38:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d52d0e45d81af3652f09a8f0931f1e78 SHA-1: 9171ded5a00f91f86b3886f3bce3359ab6e1310a SHA-256: 76d04bafe56bb10b9383703ad773edeea02f96044aa170f5fc6b20ab773d5249
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 0.7010

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/479516143/minecraft-ps4-free-game-hack PDF link annotation
    • http://uctovnictvosnv.sk/images/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://uctovnictvosnv.sk/images/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://uctovnictvosnv.sk/images/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://uctovnictvosnv.sk/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uctovnictvosnv.sk/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30BE 25880 bytes
SHA-256: aec405400b70d5a79dfcc66fe37b944f85494f5d27b79caad97e0d7e7790489e
font_01_sfnt_off00006ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC5 2824 bytes
SHA-256: 61b3a573627d4f03d30684157e1627da3b4499cefab0fdf17b45999135b0250b
font_02_sfnt_off0000746c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x746C 17784 bytes
SHA-256: eb08404513e1de89cb797b3c4bca4c8ebf2d802e230ebef8911427dd20e63131

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