Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6d80d6a98787a2…

MALICIOUS

PDF

35.4 KB Created: 2021-07-08 05:21:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 23d5e7b57afe50879d400d15f204636a SHA-1: 93924357c648c327958cb496bcd0401523a956d2 SHA-256: fc6d80d6a98787a28f49e6671250c937f86c5d1358e9ad90d4746878156c7986
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency or hacks, directing users to a known malicious redirector. The embedded URL http://netcdn.tw/app/431946152/how-to-get-free-robux-without-verification-or-surveys-game-hack is associated with malicious redirector infrastructure. This suggests the document is part of a phishing campaign 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/how-to-get-free-robux-without-verification-or-surveys-game-hack In PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/hack-para-roblox-phantom-forces_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/pubg-uc-emoji_GM1330123889.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/roblox-hack-kill-script_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-wings-of-liberty-roblox_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-hack-free-robux-websites_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/i-got-hacked-playing-roblox_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/roblox-cheat-engine-64-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/what-is-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-coins-free_GM406889139.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
font_00_sfnt_off0000305e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305E 22552 bytes
SHA-256: 1862895f31eca1d3196074927f5adf212f3a5eb57aa0f59f5389d4a29c087ff6
font_01_sfnt_off000062b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B9 19896 bytes
SHA-256: 37ec9b5a97e8c3032495185d82b71575b2e243d7fb6a4ee911979a924adec98e

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