Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a226a822690142d…

MALICIOUS

PDF

34.3 KB Created: 2021-07-20 18:32:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8fa7d0908f45c54b53ab731fcaf91cc4 SHA-1: 308564686031fbc100ab3da9297f43855bda1e92 SHA-256: 4a226a822690142df14921c6e3848027804393ef36f188f2596cbbadda944e07
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a prominent link and text related to 'free Robux', a common lure for scams. The ML classifier strongly flagged this PDF as malicious, and multiple external URLs were embedded within the document, suggesting an attempt to redirect users to potentially malicious sites. No scripts were extracted, but the presence of embedded links and the lure indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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-no-human-verification-or-survey-or-download-game-hack In PDF document text
    • https://magistrinfo.ru/images/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-robux-link_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://magistrinfo.ru/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://magistrinfo.ru/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-roblox-accounts-with-robux-that-work-2021_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_off00002d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D35 22480 bytes
SHA-256: 37d19289b6ea6563f47af42932653c8075f76a0aedd8f63e5e63bb032eb3e097
font_01_sfnt_off00005f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5F 19920 bytes
SHA-256: 318d114cafd7cea48f1a11f27c957389fae6c279952253c490b27c84185ff225