PDF malware analysis — malicious · cd8a385f50aa834c

MALICIOUS

PDF

42.6 KB Created: 2021-05-15 13:49:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: e361ccf6bd0e1d22385acd87a7d9823c SHA-1: d78a522dbb9921cf55089c2a96e7e9f5d2dba6df SHA-256: cd8a385f50aa834c374587989c08d806cbe442852f5af69ba1e13e60d7e4b887

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, forming a link farm, that point to sites offering free in-game currency or game downloads. The document body and extracted URLs suggest a lure for popular games like Robux and Coin Master, likely to trick users into visiting malicious sites or downloading further malware. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/how-to-get-free-robux-games-game-hack
- http://huounaixunghe.com/images/free-robux-2021-no-human-verification_GM431946152.pdf
- http://huounaixunghe.com/images/coin-master-mod-free-download_GM406889139.pdf
- http://huounaixunghe.com/images/how-to-change-roblox-username-for-free-2021_GM431946152.pdf
- http://huounaixunghe.com/images/coin-master-free-spins-uk_GM406889139.pdf
- http://huounaixunghe.com/images/free-spins-on-coin-master-game_GM406889139.pdf
- http://huounaixunghe.com/images/minecraft-free-download-apk-softonic_GM479516143.pdf
- http://huounaixunghe.com/images/coin-master-game-free-spin-download_GM406889139.pdf
- http://huounaixunghe.com/images/coin-master-promo-code-2021_GM406889139.pdf
- http://huounaixunghe.com/images/coin-master-hack-version-33-2_GM406889139.pdf
- http://huounaixunghe.com/images/free-minecraft-domain_GM479516143.pdf
- http://huounaixunghe.com/images/i-need-robux_GM431946152.pdf
- http://huounaixunghe.com/images/robux-earning-sites_GM431946152.pdf
- http://huounaixunghe.com/images/free-spins-coin-master-2021_GM406889139.pdf
- http://huounaixunghe.com/images/coin-master-hacks-2021_GM406889139.pdf
- http://huounaixunghe.com/images/how-to-get-free-robux-without-paying_GM431946152.pdf
- http://huounaixunghe.com/images/how-to-get-robux-easy_GM431946152.pdf
- http://huounaixunghe.com/images/free-robux-place_GM431946152.pdf
- http://huounaixunghe.com/images/free-robux-promo-codes_GM431946152.pdf
- http://huounaixunghe.com/images/free-spins-for-coin-master-game_GM406889139.pdf
- http://huounaixunghe.com/images/online-coin-master-hack-here_GM406889139.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off00004a6e.bin` `83b9c5f4b16c4f8e32730557ddd875f1610078116071b7548b8edbfb43192169`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4A6E	24456 bytes
`font_01_sfnt_off000082ac.bin` `f0658a260a8345a08039bbf50682235c712e1d6bfd9b3eebd82ad720f29012b5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x82AC	18768 bytes

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