Malicious PDF — malware analysis report

Static analysis result for SHA-256 39393df0cb890361…

MALICIOUS

PDF

44.3 KB Created: 2021-05-31 23:09:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cc134307696de8e0b90c3e97d63b63f9 SHA-1: d8466d7e9f93b8363ba717db3b74f90c2d41bb8f SHA-256: 39393df0cb89036108b88be3444e347559bdca820574dd9a32b2ed313fb8ee19
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one pointing to known malicious redirector infrastructure at `https://netcdn.xyz/app/431946152/how-to-make-a-free-robux-website-game-hack`. This lure, combined with heuristics indicating a game hack or free generator theme, suggests a phishing attempt to redirect users to a malicious site. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.xyz/app/431946152/how-to-make-a-free-robux-website-game-hack In PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/how-to-get-free-stuff-roblox-march-2021_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/how-do-you-get-robux-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/royal-navy-ships-free-models-roblox_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/roblox-hack-new-dtfb-test_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/free-robux-hack-me_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/infinite-robux-hack_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/roblox-juwelen-hack-mad-paintball_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/is-tiktok-free_GM835599320.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/hack-robux_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://acode.com.br/wp-content/uploads/fsqm-files/tiktok-viewer-free_GM835599320.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_off00004f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F23 25152 bytes
SHA-256: 4da26bb788dc4a692d8952d37c3da77be02014d8e683f1c8628b1b2e87615d55
font_01_sfnt_off000087e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87E1 19196 bytes
SHA-256: d64c2c24adb87b2ee9b1c2ee3ece24625121cb8ecb33fb40dd54c32060328443

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