PDF malware analysis — malicious · 631cda7cb72c9449

MALICIOUS

PDF

41.4 KB Created: 2021-05-13 12:36:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 6f29ec0f17918774608ca46688cc9e6b SHA-1: 57930d286832efa075662573c2f2c350403551e5 SHA-256: 631cda7cb72c9449ee0d48a0656d91af7dda9a025ede57bf47c4e7a6ecd9c477

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically advertising "game hacks" and "free spins" for popular games. The primary redirect URL is https://netcdn.xyz/app/406889139/coin-master-free-spins-that-really-game-hack, which is flagged as a malicious redirector. The document's content and structure strongly suggest a phishing or scam attempt designed to lead users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-free-spins-that-really-game-hack In PDF document text
- https://www.similar.com.tw/upload/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/roblox-website-robux_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/minecraft_GM479516143.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-free-robux_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/coin-master-attack-hack_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/minecraft-app-store-free_GM479516143.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-robux-just-click_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-rewards-coin-master_GM406889139.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_off000046b4.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x46B4	25008 bytes
SHA-256: `d02d5e5309eb98f96cb0afa8c39868a5bf7f2f15dc8f14d95d83377436e2a510`
`font_01_sfnt_off00007f6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7F6B	18308 bytes
SHA-256: `9280bacae3ad0da4146be41547e1663b6e8aa07aae351ce46264d323328a6377`

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