Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d21e40b1294ea7…

MALICIOUS

PDF

35.4 KB Created: 2021-06-27 06:49:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4b64c1e24fb4f4bcc1ba908f0dadf9e6 SHA-1: 54e9146dded8c79927c7fe23309c62beb9b9a720 SHA-256: 52d21e40b1294ea76af5c1245eeda8ef9b02f68e94cff5716db5e634e83376ef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and other PDF files, masquerading as game hacks and generators. The document body explicitly mentions 'hack-de-robux' and includes URLs that likely lead to further malicious content or phishing attempts. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive content and malicious links.

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/hack-de-robux-funcionando-2021-100-para-aser-bromas-game-hack In PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/hack-de-fly-roblox-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/future-hack-roblox_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-freer-package-roblox-2021-july_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/pubg-uc-key_GM1330123889.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-btools-press-n-script-hack_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-jordan-shirt-roblox_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_off0000318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318C 22092 bytes
SHA-256: 15aa061ecbbf00be6af46dcd9be8589324c96a1a9ae608af84826aa7ab61d0e0
font_01_sfnt_off00006254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6254 20164 bytes
SHA-256: c3d66325263b815f23682d68d3e6b513db7b14e5a2231c5d0e132b6608d3c9fc

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