Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab898a5b9a304b6e…

MALICIOUS

PDF

36.5 KB Created: 2021-05-20 16:10:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 695f0c15bb29b03e5d9208fc1fb0387a SHA-1: c0740d601de99ac2d7c3c785267f5aac81289d50 SHA-256: ab898a5b9a304b6edea659b091640127703f856232dc1b84462e9cb93f90bc68
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 0.9492

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/406889139/60-free-spins-coin-master-game-hack PDF link annotation
    • http://homequeen.de/images/mcpe-client_GM479516143.pdfIn PDF document text
    • http://homequeen.de/images/coin-master-deals_GM406889139.pdfIn PDF document text
    • http://homequeen.de/images/10-robux_GM431946152.pdfIn PDF document text
    • http://homequeen.de/images/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://homequeen.de/images/game-give-free-robux_GM431946152.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
stream_002_off000034fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34FD 25340 bytes
SHA-256: 94593889ed1a64bc33c5b13cf8c71dd4bb4b48221a8eab53c6f915d9d50c2b90
font_01_sfnt_off00006da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA4 18224 bytes
SHA-256: c1ecca62003467cdf8c5fbac224d7e39febf20c3e1f0cb28698ef381036d4826

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