Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5c14b676b7b0d9…

MALICIOUS

PDF

48.5 KB Created: 2021-06-03 06:20:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ebfb58d05fb9786266ebf513d26ec0bc SHA-1: e81c7fd5b54c03379d72b46fc238a3a2f3824e2f SHA-256: 3d5c14b676b7b0d973fcf61a94c74b010bb357fd4e79ec5b0d7db947198ab5f9
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, masquerading as game hacks or fake CAPTCHA prompts to trick users into clicking. The primary malicious URL identified is https://netcdn.online/app/431946152/how-to-use-scripts-in-roblox-hack-game-hack. The document's content and heuristics strongly suggest a phishing or social engineering attack aimed at redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/how-to-use-scripts-in-roblox-hack-game-hack In PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/pubg-uc-carding-telegram_GM1330123889.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/xray-hack_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005324.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5324 26016 bytes
SHA-256: cf0330d5afc545c3f9d9f1909bfeee4da2e664a53dd3a3e01ed8629bf9356666
font_01_sfnt_off00008f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F34 2812 bytes
SHA-256: 869414959d7b492e0f799b560e1731e3ab498bd286c28e9f0d2ec33d9b6cf53d
font_02_sfnt_off000098d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98D3 18932 bytes
SHA-256: fce9e652f89a1af62f774ff2b7937cf54d78de2903c3939778e1916a8682391a

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