Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8830994766e9221…

MALICIOUS

PDF

29.9 KB Created: 2021-07-19 01:50:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f9ac76a04d70bfac325f5ccd5beee129 SHA-1: 2fb3e94f012bd70dfbbfa619843b464944cff8f2 SHA-256: b8830994766e9221c38ea4c497689b869673edebd7a9193eb56e003f01d1cf3f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, masquerading as 'free Robux' or 'game hacks'. The primary malicious URL identified is http://netcdn.tw/app/431946152/free-robux-codes-game-hack, which is likely used to deliver a second-stage payload. The document body and embedded links strongly suggest a phishing or scam attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/431946152/free-robux-codes-game-hack In PDF document text
    • http://pianoservice.com.ua/images/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://pianoservice.com.ua/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-robux-website_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
font_00_sfnt_off000024ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24EE 21144 bytes
SHA-256: fd1c1c5d505b99d928daf86e17565121451e3d5b6876a0034d6f247d034bd354
font_01_sfnt_off000052b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52B1 18372 bytes
SHA-256: ebd16bed473c0d10154cd721ddc212c44ce3f73d33b4848c8fd41fc41acf3798

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