Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f2c830dc98516c…

MALICIOUS

PDF

36.7 KB Created: 2021-07-07 12:45:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9af17c6dd0da6e9b9246cf7d09c34f5a SHA-1: 507276a6c668a743b72212c1b5e95865ec1fec79 SHA-256: 83f2c830dc98516c82053e241b4223f2adf0e03ec8fc3d4a1d087a3f0bd7e845
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document contains multiple URLs pointing to sites offering game cheats and free in-game currency, strongly suggesting a social engineering lure. The ML classifier also flagged this PDF as malicious with high confidence. The presence of external URIs and a call-to-action heuristic further supports the conclusion that this document is designed to trick users into downloading potentially harmful files.

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-do-you-get-free-robux-without-paying-game-hack In PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/roblox-cheat-code-generator_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-link_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-characters-roblox_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/roblox-urbis-hack-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-scar-free-in-mad-city-roblox_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/your-life-free-trial-has-expired-roblox_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-free-robux-on-laptop-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-tiktok-editor_GM835599320.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/begone-nerds-roblox-hacking_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-part-avatar-roblox_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off000034f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34F6 22548 bytes
SHA-256: f8eeece083938594b3cef5320cb02ac53b699fd390875f4c9e243b26e73db5b7
font_01_sfnt_off00006743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6743 20132 bytes
SHA-256: a9ef46bf9427767a57211f84010808dc7dc7e4c48ad05ca9a6e16d4f2e8bde0e

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