PDF malware analysis — malicious · 939f7939a75f281e

MALICIOUS

PDF

36.4 KB Created: 2021-07-05 05:36:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 13419ff8643a41b3f353ad76d6fb7744 SHA-1: eeadf1266b4845baecfc25c9555429226d1f31f5 SHA-256: 939f7939a75f281e81ac77e219038ecaae56758e682fd336772221968d2d8a3e

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and lures users with promises of free game currency or hacks. The primary link, http://netcdn.tw/app/431946152/free-robux-that-actually-works-game-hack, is identified as a malicious redirector. The document body and embedded URLs suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

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/free-robux-that-actually-works-game-hack In PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/can-you-play-roblox-on-xbox-one-for-free_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/hack-list-for-roblox_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/roblox-printables-free_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-roblox-animations_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-robux-hack-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/cheating-on-roblox-girlfriend_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-minecraft-skins_GM479516143.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/exploit-roblox-download-free_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/roblox-money-hack_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/sign-up-today-to-get-free-robux_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.

Filename	Kind	Source	Size
`font_00_sfnt_off00003443.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3443	22912 bytes
SHA-256: `c2239614de50c18bde0e02cdabc8eccb3a09b08d17b11bbd03b18bc4557cc627`
`font_01_sfnt_off000067b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x67B5	19608 bytes
SHA-256: `d52712f1a35e8680be3c45e78173014feb66661a2560c5e73c6934237b8ae3d4`

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