Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef935e064fd6cba…

MALICIOUS

PDF

44.2 KB Created: 2021-06-09 14:38:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 99789f5305fc39563918124df85d1e35 SHA-1: 7a08d7e0f84c559e80cb03403234cecaeee8588c SHA-256: 2ef935e064fd6cbac7be634b42c5647dce3f7a22260d5c979ba9146156235deb
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, disguised as game cheat generators. The primary lure is for 'Cheat Codes For Roblox Royale High Android', directing users to a URL hosted on netcdn.tw. The document also contains numerous other PDF links pointing to kldcardio.ru, likely for further exploitation or payload delivery. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/cheat-codes-for-roblox-royale-high-android-game-hack In PDF document text
    • https://kldcardio.ru/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robux-site_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/free-tiktok-video_GM835599320.pdfIn PDF document text
    • https://kldcardio.ru/images/free-coin-master-s_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/roblox-shirt-texture-free-shipping_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/descargar-roblox-hackeado-para-pc-2021_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/fre-shavacado-song-compilation-roblox-id_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-aimbot-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robux-are-scams_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004c8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C8A 25680 bytes
SHA-256: 752952f85863bf66a1e7a7fe585a4a91ee0e40618e5ede4f28fd1938866ae273
font_01_sfnt_off0000874c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874C 19208 bytes
SHA-256: 9401b3a3687a40cec0ccfe24fedfc2ae798549b85c5a2a49bca8722119652920

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