PDF malware analysis — malicious · a14ff1353b27582c

MALICIOUS

PDF

33.1 KB Created: 2021-07-06 07:45:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 565796834cf0bd443e6097dba9b6bcf3 SHA-1: 724a78d7e3d49ee85463f12d46cf9160f17ec8d9 SHA-256: a14ff1353b27582c8b53507e152e5046d15bfcd4e7fe3fbfff07f187b09ed14c

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 the URL http://netcdn.tw/app/431946152/free-robux-hack-us-game-hack. This URL and numerous others hosted on linhkien247.vn are likely part of a phishing or malware distribution chain. The ML classifier strongly flagged this PDF as malicious, supporting the observed lure.

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/free-robux-hack-us-game-hack PDF link annotation
- https://linhkien247.vn/public/upload/files/robux-free-co_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/roblox-lighting-hack_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/roblox-free-robux-cheats_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/give-me-robux_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/roblox-retail-tycoon-cheats_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/how-to-hack-other-peoples-accounts-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/how-to-get-free-robux-2021-youtube_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/how-to-get-free-robux-on-mac-2021_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/free-robux-scam-messages_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/get-robux-com_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/roblox-frees-tag_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/hacking-method-for-roblox-accounts_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/hack-adopt-me-roblox-2021_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/free-robux-no-verification-no-download_GM431946152.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_off00002d28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2D28	21568 bytes
SHA-256: `9b19cf350450bd75a091d970947f729a841d6feaf7f603fca324451800e66de5`
`font_01_sfnt_off00005cb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5CB4	18884 bytes
SHA-256: `bfc674629a4fdfc233a3c1a19cbee54387e60bd0cdfc4a3107778b42d9fa82d8`

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