PDF malware analysis — malicious · 4591b4a1ab4aaffa

MALICIOUS

PDF

48.7 KB Created: 2021-06-11 13:26:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 2886ca375ac841e7d5b57921b7327dd8 SHA-1: 8891305b64bff8d0899a0c70a8363097119c012b SHA-256: 4591b4a1ab4aaffa5ab3e19c244af88cd348af364d21dcd540077a5a5334435c

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links to external websites, many of which are structured as SEO-optimized PDF gateways. The document body and extracted URLs suggest a lure for users seeking game cheats and hacks, such as for Roblox and Coin Master. The presence of a PDF_SEO_LINK_FARM heuristic indicates a large number of these links, likely intended to redirect users to malicious content or further phishing attempts.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-accs-free-game-hack PDF link annotation
- https://cosmosocean.com.tw/upload/files/coin-master-hack-review_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/game-give-free-robux_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/earn-free-robux-robloxwin_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/minecraft-menu_GM479516143.pdfIn PDF document text
- https://cosmosocean.com.tw/upload/files/thebuxian-you-have-robux-try-hack-today_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000505f.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x505F	27288 bytes
SHA-256: `0d1569c9099906aa010f5aecfa70ad9a647c365f5fba569ac53f8d31857f966c`
`font_01_sfnt_off00008f86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F86	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off00009c97.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9C97	17948 bytes
SHA-256: `a0634e5375286bbc89e999025389d819919be572a124ff4c85d58501137e6b80`

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