PDF malware analysis — malicious · 56a451091cbef87a

MALICIOUS

PDF

34.1 KB Created: 2021-07-01 02:35:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15

MD5: cdaa54e00a8c6d481567d8a1c7d9aec9 SHA-1: bf92a70f09fd69bcdf63fbde40e0481f82d0c391 SHA-256: 56a451091cbef87a3588c9fbd3c8202c636f9f3d345d66ca9d179fa38d7f683f

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs and a 'download button' lure, suggesting it is designed to trick users into downloading potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm of SEO-optimized PDFs related to game hacks further supports this. The primary goal appears to be driving traffic to external sites that likely host malware or scams.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/835599320/free-tiktok-fans-hack-game-hack PDF link annotation
- https://xhse.vn/public/upload/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
- https://xhse.vn/public/upload/files/hack-for-roblox-jailbreak-downloads_GM431946152.pdfIn PDF document text
- https://xhse.vn/public/upload/files/coin-master-tricks_GM406889139.pdfIn PDF document text
- https://xhse.vn/public/upload/files/coin-master-free-spins-iphone_GM406889139.pdfIn PDF document text
- https://xhse.vn/public/upload/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://xhse.vn/public/upload/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
- https://xhse.vn/public/upload/files/roblox-cheats-android-robux_GM431946152.pdfIn PDF document text
- https://xhse.vn/public/upload/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
- https://xhse.vn/public/upload/files/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
- https://xhse.vn/public/upload/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
- https://xhse.vn/public/upload/files/how-to-use-a-cheat-on-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
- https://xhse.vn/public/upload/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://xhse.vn/public/upload/files/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
- https://xhse.vn/public/upload/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
- https://xhse.vn/public/upload/files/roblox-vietnam-2021-aimbot-hack_GM431946152.pdfIn PDF document text
- https://xhse.vn/public/upload/files/jentplays-roblox-free-robux_GM431946152.pdfIn PDF document text
- https://xhse.vn/public/upload/files/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
- https://xhse.vn/public/upload/files/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
- https://xhse.vn/public/upload/files/how-to-hack-roblox-games-no-downloads-2021_GM431946152.pdfIn PDF document text
- https://xhse.vn/public/upload/files/roblox-spin-head-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
`stream_002_off000030fa.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x30FA	22596 bytes
SHA-256: `502404e15623db4eea2433a1661b5697f650c8b57b32dbca6e3cac954c2d1b55`
`font_01_sfnt_off0000637f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x637F	17972 bytes
SHA-256: `13f87daf106d1a749dc561b3aeaa0d0bb6f68d187290c348d15b869261527638`

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