PDF malware analysis — malicious · e4fb21eebde4be72

MALICIOUS

PDF

41.4 KB Created: 2021-04-28 18:51:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 540d3691eff6f492eac5fa7d8e96509a SHA-1: ac4734b9d7149ad7c9aca10a1fc3b936fc8d2ef9 SHA-256: e4fb21eebde4be72d51858ee518ad34bbe577df73f135accbc9af7cabb1b61ec

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links and a call-to-action phrase designed to trick users into visiting a malicious redirector. The primary lure is a 'free Robux generator' which leads to the URL https://netcdn.xyz/app/431946152/free-robux-glitch-2021-september-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at credential harvesting or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9941

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 https://netcdn.xyz/app/431946152/free-robux-glitch-2021-september-game-hack In PDF document text
- https://lib-stie.yai.ac.id/repository/roblox-hack-site-cheat-engine.pdfIn PDF document text
- https://lib-stie.yai.ac.id/repository/best-games-to-get-free-robux.pdfIn PDF document text
- https://lib-stie.yai.ac.id/repository/roblox-hack-cheat-engine-2021.pdfIn PDF document text
- https://lib-stie.yai.ac.id/repository/roblox-cheat-zombie-rush.pdfIn PDF document text
- https://lib-stie.yai.ac.id/repository/free-2021-roblox-accounts.pdfIn PDF document text
- https://lib-stie.yai.ac.id/repository/free-auto-clicker-roblox-mac.pdfIn PDF document text
- https://lib-stie.yai.ac.id/repository/poki-with-free-roblox.pdfIn PDF document text
- https://lib-stie.yai.ac.id/repository/code-for-free-robux-2021.pdfIn PDF document text
- https://lib-stie.yai.ac.id/repository/free-robux-no-hacking-2021.pdfIn PDF document text
- https://lib-stie.yai.ac.id/repository/counter-blox-roblox-offensive-free-esl.pdfIn PDF document text
- https://freerobux.cyouIn 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
`stream_003_off00004285.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4285	25692 bytes
SHA-256: `0054ca7ada07a4459de058f540306945b6d311ca21f13ad3b983265d174f8cbf`
`font_01_sfnt_off00007d15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7D15	19316 bytes
SHA-256: `899fd71448e03c4e428d784dcf30d5a2d360c6b2c43037a159cbd689c33f81d7`

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