Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f63487a8f2ac479…

MALICIOUS

PDF

35.9 KB Created: 2021-06-26 22:01:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c121f725abde392c3b3b1eef9dd5f32b SHA-1: 38dfb1a1bfa303a477885b2c80a58b98dae42b87 SHA-256: 1f63487a8f2ac4791f52309f648f3127861b2c3bc4a121b2377c13dcf992a4d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, including one pointing to 'netcdn.co', which is associated with game hacking content. The ML classifier strongly flagged this PDF as malicious. The presence of these URLs suggests an attempt to direct users to external sites for downloading potentially harmful files or accessing malicious services. No scripts were extracted, limiting further analysis of specific execution methods.

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.co/app/431946152/how-to-speed-hack-in-roblox-with-check-cashed-2021-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-a-free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/apk-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-minecraft-com_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-link-app_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/boku-no-roblox-remastered-op-gui-script-hack_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/tiktok-free-bot_GM835599320.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/greasy-fork-roblox-hack_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/2021-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-coins-generator_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
font_00_sfnt_off000031c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C3 22512 bytes
SHA-256: 0fcd4c5aec914c78b70b3a719afcf3c3aa4bc14c05aa85beca33720a38dd6c66
font_01_sfnt_off0000640e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640E 20160 bytes
SHA-256: 394c3de65eef35c9d545b36f31526fa4f8a72ac49bf3120e601f1e3672b9f270

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