Malicious PDF — malware analysis report

Static analysis result for SHA-256 521ec9f22f728d99…

MALICIOUS

PDF

42.4 KB Created: 2021-05-19 12:03:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 15590c605663c300d53e768f25fed130 SHA-1: 31646c59d3f349210055f095e9efad8831fa5631 SHA-256: 521ec9f22f728d99dafe95eeaaab8b0e659f01e2e6d36fc3f93df86c0cb81cfe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to known malicious redirectors, specifically targeting users with lures related to game hacks and free generators. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. The presence of these links and the heuristic firings strongly suggest an attempt to redirect users to malicious infrastructure, likely for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/daily-free-spins-coin-master-game-hack In PDF document text
    • http://asiasieja.pl/images/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-free-spins-link-cheat_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_003_off00004902.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4902 26116 bytes
SHA-256: 812d41f5b5a3406be26b4538ca567fbb206d1cc548e4461c7d57b1718b9b3680
font_01_sfnt_off00008376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8376 18308 bytes
SHA-256: 814bd0a2b88bdef89f3245e401f7fc464bd7314e61fe604409dcfddce4500050

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