PDF malware analysis — malicious · f83cc94355d34d7a

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 11:20:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17

MD5: 9f7ba5104ce7d5cc6b42183df07e3048 SHA-1: 0670291aab69fc8902cc3b118f5184777692dd6b SHA-256: f83cc94355d34d7a08c3bb219e004fd1160411a47e3d3e68c28c6abdbee66699

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Robux' and game hacks, directing users to a suspicious URL. The ML classifier strongly indicated maliciousness, and the embedded URL is associated with a known redirection tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 4

PDF links to a 'free generator / game hack' redirector high 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.
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
External URI info PDF_URI

PDF contains an external URL action
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/robux-com-free-robux-game-hack PDF link annotation
- https://cosmosocean.com.tw/upload/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-roblox-accounts-with-robux-2021-november_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/clothes-on-roblox-free_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/roblox-game-development-kids-free_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-games-online-like-roblox_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/where-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/robux-login-free_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/how-to-get-the-marshmallow-head-in-roblox-for-free_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-robux-hack-real-2021_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-cute-clothes-on-roblox_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-robux-apk-oct-18-2021_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/minecraft-redeem-code-free_GM479516143.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_off00002d92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2D92	22532 bytes
SHA-256: `1e76fb1c61edd80c30a70ce493c66af28d3606fe237205f30f751ce928acd8c2`
`font_01_sfnt_off00005fca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5FCA	18976 bytes
SHA-256: `27896acad5ca474033774e3721745fbaf6546dbb33b60a4a93bb974a81ff43ff`

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