Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8c841be668ce1e…

MALICIOUS

PDF

36.1 KB Created: 2021-05-22 19:05:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f9bb21d9cd6dfd7961012001713ee085 SHA-1: 2a784a54973fd6e79a6f0710e55706caecf650d9 SHA-256: ef8c841be668ce1e69658fbafeb6a93dec14f7cb9d274fec1b7825e57889b31e
122 Risk Score

Malware Insights

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

The PDF document contains multiple links, with a primary focus on a 'free generator / game hack' lure. This lure is designed to trick users into interacting with a fake CAPTCHA or verification prompt, likely to execute further malicious actions. The document body and heuristics strongly suggest a social engineering tactic to compromise the user.

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/479516143/how-to-get-minecraft-java-for-free-game-hack PDF link annotation
    • http://www.businessgalaxy.lk/files/files/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-date-and-time-hack_GM406889139.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_off00003528.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3528 24492 bytes
SHA-256: 4cc030ba6c9e02a61360736d6b4f858ef13e5ace6d3d872c0380a5cdffb54ea7
font_01_sfnt_off00006c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5B 18152 bytes
SHA-256: f45ec97da20a8e70f6e7437c3ced33d3bcbd99aef5af4daf3be0ff08d51a9e58

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