PDF malware analysis — malicious · 0f43f878f2db9fe0

MALICIOUS

PDF

35.1 KB Created: 2021-06-28 10:00:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 481b75881be1b7d3861a401e9d53fbc9 SHA-1: f93f39efd471cdc94d704c0b16151bba9187d39c SHA-256: 0f43f878f2db9fe0261ae5cb58e945dcba4ef89d307d2c69185b4327ef7c5603

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Robux' and game hacks, which is a common social engineering tactic to entice users to click on malicious links. The primary malicious URL identified, http://netcdn.co/app/431946152/rblx-city-earn-free-robux-game-hack, is directly linked to this lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a malicious redirector designed to deliver a second-stage payload.

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.co/app/431946152/rblx-city-earn-free-robux-game-hack PDF link annotation
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/roblox-sued_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-robux-easy-and-fast-2021_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/tiktok-free-views_GM835599320.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-roblox-clothes-for-girl_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/how-to-get-items-on-roblox-for-free_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/roblox-titanic-infinite-points-script-hack_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_off00003349.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3349	21904 bytes
SHA-256: `7736dcba5c2ced0f5255761fb3b85f7a73272f4878c89fea2346c6d8c7a90750`
`font_01_sfnt_off00006398.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6398	19196 bytes
SHA-256: `40abaacc1fff25e1c981a912c8a6f046338a02ee11519e13a39ce26d3d652d46`

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