Malicious PDF — malware analysis report

Static analysis result for SHA-256 a915cc1e87c57dec…

MALICIOUS

PDF

35.1 KB Created: 2021-06-29 18:06:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7acef2a67b614ba97e56b04e6821883e SHA-1: 9cc4f3d9d508aedc94255cc3a3b1a0708e13763b SHA-256: a915cc1e87c57dec1d22fbf0485d018851522f5f4707ad66786341842b10da67
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are SEO-optimized and point to sites offering game hacks or free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of a download button lure suggests an attempt to trick the user into downloading a payload. The document body and embedded links indicate a lure related to Roblox and other games.

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/roblox-cool-t-shirts-free-marshello-game-hack
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-online-play-hack-for-free-robux_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/test-all-roblox-gear-hats-and-shirts-free_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/how-do-u-get-free-robux_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/codes-to-get-free-robux_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/minecraft-windows-10-free_GM479516143.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/easy-free-robux-hack-2021_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/daily-spin-coin-master-free_GM406889139.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/rblx-city-free-robux_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-no-scam-no-human-verification-2021_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-no-hack-no-download_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/grabpoints-robux_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-download_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-links-coin-master_GM406889139.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/oginject-co_GM406889139.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-game-hack-kaise-kare_GM406889139.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/wwwcoin-master-hack-game-download_GM406889139.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-studio-free-robux_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/i-will-hack-and-not-kill-parent-roblox-group_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000314e.bin
d25fff592c21416e01f740a48735896dd02cc0cfb9060d8354f1f3a5315c87d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x314E 22552 bytes
font_01_sfnt_off000063d0.bin
8dad2a01d1047b0ad9d747270ae31cfe84229c923f6305e8aaa0651b624989eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D0 19236 bytes

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