Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3ded84933ae54e…

MALICIOUS

PDF

32.3 KB Created: 2021-07-19 20:03:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b0d5c3cb83978502ad3401bd3b618293 SHA-1: 3f3794716c99fb506080e41df8ada0ca9e2ca696 SHA-256: 4c3ded84933ae54edaaa1c1b4d6d2bf722607a360280ba625aa7472ca63410eb
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with the promise of 'Robux Hack Me' and 'game hack' generators. The document body explicitly contains the URL 'http://netcdn.tw/app/431946152/robux-hack-me-game-hack', which is identified as a malicious redirector. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/robux-hack-me-game-hack In PDF document text
    • http://rivne.media/ckfinder/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/free-robux-site_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/free-minecraft-accounts-2021_GM479516143.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_off0000291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x291C 22472 bytes
SHA-256: 524ed4386086e045a191ca15220fb688f26c4ca0ee01c5ff81a3fae0f00b9f0c
font_01_sfnt_off00005b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B04 18632 bytes
SHA-256: c8da56bbbb3df747cf2213435dde956968f4dc6fc6a1da517dd961d035af3807

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