PDF malware analysis — malicious · 77ecb50c81a34477

MALICIOUS

PDF

41.6 KB Created: 2021-04-26 10:02:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 03876625e41cac4c10a0db28e5d06e48 SHA-1: ccd45d08b7b115643251cd4e85d5fad6d0717e9e SHA-256: 77ecb50c81a34477d13b113bf3a87aee777b3ebc4b57ab964ad687a6ed1d5be6

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The ML classifier strongly indicated maliciousness, and the presence of numerous redirector links reinforces this assessment. The document body, though partially obfuscated, contains URLs that are consistent with the lure.

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/roblox-phantom-forces-hack-2021-august-game-hack In PDF document text
- https://bioscience.kyst.com.tw/image/data/files/hacks-en-csgo-roblox-en-espaol.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/exploit-roblox-2021-free.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/roblox-free-radio.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-easy-2021-october.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/roblox-hack-hack-de-robux-2021-android.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/robux-hacktxt.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-on-computer-for-kids.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/aether-hack-roblox.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/roblox-free-robux-online.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/cool-free-faces-on-roblox.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
`stream_003_off000041ff.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x41FF	25304 bytes
SHA-256: `3fbd5be9d7919ad49b54abf6506834d9c1815f93ea50b5a513557357c8cb6c92`
`font_01_sfnt_off00007c68.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7C68	19860 bytes
SHA-256: `63b371ed281a65c65ad26c9b0c6712df77f5048ef8813660a3bccb0d3aa676f4`

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