Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e90e55138f21c36…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 08:19:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b8f3b05fe64abba58cd5379497f0fff9 SHA-1: a0eeee4354f414575604003568ba158acad31a34 SHA-256: 1e90e55138f21c360192a887844caaa1ce47bf2dea6f5322dd9679a6bce80d2a
168 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links, including one pointing to known malicious redirector infrastructure. The document body and heuristics indicate a lure for "game hacks" or "free spins" to trick users into clicking the malicious link. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.online/app/406889139/coin-master-free-spins-and-coins-link-today-game-hack In PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/master-hack-coin_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-download_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/het-free-robux-website_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-com-free-robux_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
stream_004_off000051cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51CB 25096 bytes
SHA-256: 66be8a2263c3cb5df81f0f57d6639658f3744a65ed96addec8123daf5521ce85
font_01_sfnt_off00008c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C54 18412 bytes
SHA-256: 5606d742d49c2f618a839db89fb2f395f675f912dcc06d31cfc3972fb9700339

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