PDF malware analysis — malicious · b2e5bf42abe3de83

MALICIOUS

PDF

49.7 KB Created: 2021-06-10 21:07:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 93f20cb7c6e3d5b10ba98d9557c4e2fd SHA-1: ac8133abc3034c28e355f0a298804852b5339838 SHA-256: b2e5bf42abe3de835c834a964c712f1f2fe02563542eed1c80f2d4ac9406ad88

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to external resources related to game hacks and free in-game currency. The document body explicitly mentions 'how-to-get-free-robux' and includes a call-to-action, indicating a lure for users to click these links. The presence of a PDF link farm heuristic further suggests a malicious intent to distribute or redirect users to potentially harmful content.

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/how-to-get-free-robux-easy-2021-no-human-verification-game-hack
- https://www.unicor.co.th/assets/editoruploads/files/coin-master-lucky-patcher-hack_GM406889139.pdf
- https://www.unicor.co.th/assets/editoruploads/files/free-coin-master-spins-blog_GM406889139.pdf
- https://www.unicor.co.th/assets/editoruploads/files/roblox-hacked-version_GM431946152.pdf
- https://www.unicor.co.th/assets/editoruploads/files/www-roblox-com-robux-free_GM431946152.pdf
- https://www.unicor.co.th/assets/editoruploads/files/free-spins-for-coin-master_GM406889139.pdf
- https://www.unicor.co.th/assets/editoruploads/files/roblox-promo-code-to-get-free-robux_GM431946152.pdf
- https://www.unicor.co.th/assets/editoruploads/files/earn-free-robux-on-roblox_GM431946152.pdf
- https://www.unicor.co.th/assets/editoruploads/files/mcpe-master-hack-unlimited-coins-download_GM406889139.pdf
- https://www.unicor.co.th/assets/editoruploads/files/how-do-you-get-minecraft-for-free_GM479516143.pdf
- https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
- https://www.unicor.co.th/assets/editoruploads/files/free-coins-for-coin-master-blogger_GM406889139.pdf
- https://www.unicor.co.th/assets/editoruploads/files/roblox-free-hats_GM431946152.pdf
- https://www.unicor.co.th/assets/editoruploads/files/how-to-hack-roblox-games_GM431946152.pdf
- https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-spins-reddit_GM406889139.pdf
- https://www.unicor.co.th/assets/editoruploads/files/clean-master-free-coins-and-spins_GM406889139.pdf
- https://www.unicor.co.th/assets/editoruploads/files/jailbreak-roblox-hack-money-2021_GM431946152.pdf
- https://www.unicor.co.th/assets/editoruploads/files/minecraft-java-hacks_GM479516143.pdf
- https://www.unicor.co.th/assets/editoruploads/files/mobihack-net-roblox-hack_GM431946152.pdf
- https://www.unicor.co.th/assets/editoruploads/files/how-to-download-minecraft-for-free-ios_GM479516143.pdf
- https://www.unicor.co.th/assets/editoruploads/files/roblox-free-clothes-generator_GM431946152.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000054c3.bin` `3a3f412b018635f88c9e2280c5ca4012a16fba1e8187d0ec1377873e619db8dc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x54C3	25416 bytes
`font_01_sfnt_off00008ef4.bin` `40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8EF4	3884 bytes
`font_02_sfnt_off00009b9c.bin` `02d06b1f8376f38167a6ef525a68716a8af6d59fd1a7dca153c5d9ddd4c0c14c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9B9C	19604 bytes

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