PDF malware analysis — malicious · c4142ef776258cbe

MALICIOUS

PDF

35.6 KB Created: 2021-06-27 12:51:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: e838df6dd051c08d2c3076bcc9ec08f4 SHA-1: 5205407915e315655082b9572052f6f4314adfc2 SHA-256: c4142ef776258cbe65fdadb7d64ad57cf3d8cc2a09a0cd96a395a478d171ddcd

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains a lure for game hacks, specifically targeting Roblox users. It embeds a link to a known malicious redirector, http://netcdn.co/app/431946152/new-2021-roblox-exploit-hack-superskidv1-game-hack, which likely serves as a landing page for downloading malware. The document body and embedded URLs reinforce the theme of exploiting game vulnerabilities.

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/new-2021-roblox-exploit-hack-superskidv1-game-hack In PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/cupcake-hacks-roblox_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/cheat-on-lumber-tycoon-roblox_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/simplysarc_GM479516143.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/roblox-hack-trial_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/roblox-decal-for-free_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/pokemon-go-free-weekly-remote-raid-pass_GM1094591345.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/free-roblox-wings_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/pubg-uc-buy-free_GM1330123889.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
- https://www.jjautomation.in/uploaded_files/userfiles/files/pokemon-go-five-free-raid-passes_GM1094591345.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.

Filename	Kind	Source	Size
`font_00_sfnt_off000030ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30EA	22308 bytes
SHA-256: `f3d938032e0fd637f6012b6d1675f53dca6d2bf642136d9e7866f7b097656c95`
`font_01_sfnt_off000062c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62C0	20052 bytes
SHA-256: `bea5b4232e8775f08824af91e152f97af526aabd47b884c56d956d0e3a4ea93c`

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