PDF malware analysis — malicious · 39d78c0707569f71

MALICIOUS

PDF

44.2 KB Created: 2021-06-11 09:21:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: a034a756a6bff5b3d08749b90d6ff1a9 SHA-1: a1f70737d3c426c0d34c6e77a3cc12afd005223b SHA-256: 39d78c0707569f7161fc71564677bfd24c3b1ab0e2567c0ce00574fb6b3e4851

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified as a link farm, pointing to various websites offering free in-game currency and hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a lure to external malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

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/rbx-tools-free-robux-game-hack
- http://instrutech.co.th/images/free-spins-for-coin-master_GM406889139.pdf
- http://instrutech.co.th/images/haktuts-coin-master-free-daily-spins_GM406889139.pdf
- http://instrutech.co.th/images/mcpe-master-hack-unlimited-coins_GM406889139.pdf
- http://instrutech.co.th/images/free-robux-on-ipad_GM431946152.pdf
- http://instrutech.co.th/images/get-free-robux_GM431946152.pdf
- http://instrutech.co.th/images/get-free-robux-no-human-verification-or-download_GM431946152.pdf
- http://instrutech.co.th/images/free-robux-site_GM431946152.pdf
- http://instrutech.co.th/images/free-robux-without-downloading-apps_GM431946152.pdf
- http://instrutech.co.th/images/how-to-get-free-tiktok-followers_GM835599320.pdf
- http://instrutech.co.th/images/robux-generator-no-human-verification-2021_GM431946152.pdf
- http://instrutech.co.th/images/flip-master-free-coins_GM406889139.pdf
- http://instrutech.co.th/images/free-coin-master-spins-2021-link_GM406889139.pdf
- http://instrutech.co.th/images/new-code-free-robux_GM431946152.pdf
- http://instrutech.co.th/images/coin-master-free-spins-link-2021_GM406889139.pdf
- http://instrutech.co.th/images/how-to-win-free-robux_GM431946152.pdf
- http://instrutech.co.th/images/roblox-promo-codes-for-free-robux_GM431946152.pdf
- http://instrutech.co.th/images/free-robux-gift-card-codes-2021-unused_GM431946152.pdf
- http://instrutech.co.th/images/free-robux-codes-2021-real_GM431946152.pdf
- http://instrutech.co.th/images/coin-master-free-spins-link-download-hack_GM406889139.pdf
- http://instrutech.co.th/images/how-to-get-free-hair-on-roblox-2021_GM431946152.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00004f36.bin` `12d8d3fe3cf71cef661b4ac52d0ebeb341b994be11046ba9ff2ffaeeb3540892`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4F36	25908 bytes
`font_01_sfnt_off00008ae6.bin` `eab38537f05788b54a8848c56428fc618a86b633f36a9b7970d201a8ce70835e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8AE6	18088 bytes

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