PDF malware analysis — malicious · b34067d7c6dbcf5a

MALICIOUS

PDF

41.7 KB Created: 2021-05-11 23:30:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17

MD5: 2a10a4b389fafbe9a90f922868d5e71e SHA-1: 6022dd6c637bb2286f2db229fb5a8950fddd8741 SHA-256: b34067d7c6dbcf5aa5778e56feb53b2d2069ef1adc77e755dda15a2e5b48fbb5

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains numerous external links, many of which point to other PDF files hosted on cosmosocean.com.tw, suggesting a link farm designed to distribute malicious content. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malware. The primary URL https://netcdn.xyz/app/431946152/free-robux-on-phone-game-hack is likely the initial download destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

Heuristics 4

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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 https://netcdn.xyz/app/431946152/free-robux-on-phone-game-hack PDF link annotation
- https://cosmosocean.com.tw/upload/files/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/coin-master-blogspot-free-spins_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
`font_00_sfnt_off000047ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x47EF	24808 bytes
SHA-256: `f8b83f35f5cd471776eebe6a56f9009ca1c1833552138a3ad08123852cc92e75`
`font_01_sfnt_off000080aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x80AA	18332 bytes
SHA-256: `a8c9403bd24fc6ffbb74b72c8864e8746fc5e9ab0f3a7e731dec7195ce2a3638`

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