Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61864e4f4754c4b…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 09:01:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7e66fb71978aed6f133c9ee8ae726f3e SHA-1: 6c7f1a29c6e779045153994efb54c4ab3e7a39cb SHA-256: c61864e4f4754c4b62aaba6b9e5898ad511ae8e8795735fa7477bea198ff33c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency and hacks, directing users to a known malicious redirector. The embedded URL `http://netcdn.tw/app/431946152/easy-way-to-get-free-robux-game-hack` is associated with malicious redirector infrastructure. The document's content and heuristics strongly suggest a phishing or scam attempt designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/easy-way-to-get-free-robux-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/all-client-roblox-hack_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/hack-mega-matar-gente-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/pokemon-go-free-latest-version_GM1094591345.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-item-generator-hack-that-game_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-god-mode-hack-script_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-ultimate-driving-trucker-money-hack_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-and-spin_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/random-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/get-free-robux-no-human-verification-real_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/synapse-roblox-hack_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-no-download-hack_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
font_00_sfnt_off000030fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30FD 22300 bytes
SHA-256: ed97046a3f9e6ba50ba7cf929041795eb9c920d6e653fc6db7b4cd0d8d5a9605
font_01_sfnt_off0000629a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629A 19196 bytes
SHA-256: 64e8f018724e62164b0ada1d77f482f882d8547e2dcd2accc6d14ba4748306e9

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