Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2f0e69d0579bea…

MALICIOUS

PDF

46.0 KB Created: 2021-06-08 19:30:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4d2f09afd432c8ea0e5a2b45ba2e34c8 SHA-1: 7e1c5a6f6a82a3817df97111b90361cccf4cc97d SHA-256: 4a2f0e69d0579beafc49769e693b1929ecfc52dbbed1d51c8f08cd23c596beba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and generators. The primary lure URL is https://netcdn.tw/app/431946152/roblox-glames-with-gliders-free-game-hack, which is associated with a high-risk score. The document body, though heavily obfuscated, contains references to this URL and appears to be designed to trick users into clicking through to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-glames-with-gliders-free-game-hack In PDF document text
    • http://centr-expert.su/images/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-high-school-money-hack-2021_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-hair-on-roblox-for-girls_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/pokemon-go-free-40k_GM1094591345.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-daily-free-spins-blogspot_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_004_off000054ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54AD 26044 bytes
SHA-256: ed6ce45adf7b9fd19c1e8819a8833cfdea6128ea832a43583b341cccd89164cc
font_01_sfnt_off00008ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA7 19200 bytes
SHA-256: a89299507712c72bd8546fda49bfb6123d48c851dd8bc6247b0a6ee8365e6b05

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