Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ef0181b88e29fd…

MALICIOUS

PDF

36.2 KB Created: 2021-05-23 15:27:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 451d2cc6f146c64c24168d21a0e9a273 SHA-1: 2665e24151c7a16d56e30c2817dedd267ef0d707 SHA-256: 21ef0181b88e29fd7b1f40ee3d5d2af55e4051fd27b5a3857b01e5ad716c4d6d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs and document body text that explicitly lure users with promises of free Robux and game hacks. These lures direct users to malicious redirectors and other potentially malicious PDF files hosted on suspicious domains. The ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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 https://netcdn.xyz/app/431946152/free-robux-offers-game-hack In PDF document text
    • http://mypizzaoven.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://mypizzaoven.com/images/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://mypizzaoven.com/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/impact-minecraft-hack_GM479516143.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_off00003155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3155 26820 bytes
SHA-256: 0ce02edebf8baea367338c4b7c06a58b21f22406168df915366edc8a3a4fe1a4
font_01_sfnt_off00006ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE3 18012 bytes
SHA-256: 2fb616bca13af88ff89276a9b2d2fcc075dc4ebb9507e4cf45ab0719cef726f6

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