Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c2b979ac6e32c9…

MALICIOUS

PDF

34.9 KB Created: 2021-06-18 20:10:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f077c51b8742702c29989ecb5f59ad21 SHA-1: 25add101afc1c665b1785983d5b635143d85ba4c SHA-256: 53c2b979ac6e32c93b549ecee282030e395af6d1184e23c2c7abb382141661bb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game hacks and generators to entice users into clicking malicious links. The embedded URLs, such as http://netcdn.co/app/431946152/free-roblox-exploit-no-virus-game-hack, are flagged as malicious redirectors. The document's content and structure strongly suggest it is part of a phishing or scam campaign designed to lead users to potentially harmful websites.

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/free-roblox-exploit-no-virus-game-hack In PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/robux-hack-xonnek_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/roblox-guess-that-character-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-images_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/freespinandcoin_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-hack-roblox-ios_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/robux-boost_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
font_00_sfnt_off0000317c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317C 22284 bytes
SHA-256: 3f5fa6f99ffa5bf36c89a389062e35981665b1b79856954df772bd0a2516c0e9
font_01_sfnt_off0000630f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630F 19140 bytes
SHA-256: ed20088603fb155fc82b98d077ffcc2d075fbc9ded1c4da588bfb0c82054a32f

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