PDF malware analysis — malicious · 8307618d84a47745

MALICIOUS

PDF

34.4 KB Created: 2021-06-22 20:34:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: ac1d835b4517ba3b24b21e7410d1cae1 SHA-1: d952cc87796abd2de23ff37e73520da9d2541701 SHA-256: 8307618d84a477450519512ce500823b7b915cb52b8dfb5027f5ee9eae4bebdf

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a link farm, containing numerous external links to other PDFs, many of which are SEO-optimized and related to game hacks and free currency. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a 'download' lure further supports a malicious intent. The primary goal appears to be directing users to external sites that likely host further malicious content 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/431946152/cool-roblox-free-games-game-hack PDF link annotation
- https://www.cow-style.com.tw/upload/files/easy-robux-today_GM431946152.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/how-you-get-robux_GM431946152.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/roblox-hack-get-unlimited-robux-november-2021_GM431946152.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/www-free-robux-com_GM431946152.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/codes-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/does-spyevan-hack-on-roblox_GM431946152.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/roblox-avatar-com_GM431946152.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.cow-style.com.tw/upload/files/minecraft-pe-free-download-android_GM479516143.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_off000030c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30C6	22096 bytes
SHA-256: `c9730908beca7ab6fdbd7c872c088d1c9462ee525c564063b1ee44f65f4fcbc6`
`font_01_sfnt_off000061c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x61C7	18908 bytes
SHA-256: `160ea2cc23e0556e8f8eecfc0e24c392d709a96886d45994c01e7c5db5abfdc2`

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