Malicious PDF — malware analysis report

Static analysis result for SHA-256 284878a318f5da96…

MALICIOUS

PDF

35.1 KB Created: 2021-06-22 01:02:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a23c2268c742f7e4ae6076f667a82cbb SHA-1: db1989932068cd6da685532c6da8cdd091665515 SHA-256: 284878a318f5da96a82ecec80995245b945efc7c67ce748726b70a7dc4b14ea4
102 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are presented as PDF files themselves, suggesting a link farm or redirection mechanism. The document body explicitly mentions 'free Robux' and 'game hack', aligning with the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to malicious content.

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/how-do-you-get-free-robux-in-real-life-game-hack
    • https://www.devries-group.de/images/free-fans-on-tiktok_GM835599320.pdf
    • https://www.devries-group.de/images/free-diamonds-coin-master_GM406889139.pdf
    • https://www.devries-group.de/images/were-are-safe-whitelist-roblox-hack_GM431946152.pdf
    • https://www.devries-group.de/images/roblox-be-crushed-by-a-speeding-wall-hack-script_GM431946152.pdf
    • https://www.devries-group.de/images/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://www.devries-group.de/images/how-to-generate-free-coin-master-spin_GM406889139.pdf
    • https://www.devries-group.de/images/roblox-join-players-that-arent-freind-hack_GM431946152.pdf
    • https://www.devries-group.de/images/how-to-hack-roblox-accounts_GM431946152.pdf
    • https://www.devries-group.de/images/free-robux-codes-not-used_GM431946152.pdf
    • https://www.devries-group.de/images/mobihack-roblox-hack_GM431946152.pdf
    • https://www.devries-group.de/images/actual-free-robux_GM431946152.pdf
    • https://www.devries-group.de/images/coin-master-tricks-and-hacks_GM406889139.pdf
    • https://www.devries-group.de/images/how-to-get-free-hats-on-roblox_GM431946152.pdf
    • https://www.devries-group.de/images/coin-master-free-coins-and-spins-link-today_GM406889139.pdf
    • https://www.devries-group.de/images/www-bloxyworld-com-free-robux_GM431946152.pdf
    • https://www.devries-group.de/images/how-to-get-hacks-for-medieval-warfare-roblox_GM431946152.pdf
    • https://www.devries-group.de/images/free-robux-games-on-roblox_GM431946152.pdf
    • https://www.devries-group.de/images/paste-bin-free-robux-no-wait_GM431946152.pdf
    • https://www.devries-group.de/images/best-way-to-get-robux_GM431946152.pdf
    • https://www.devries-group.de/images/rblx-gg-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003128.bin
0d8811d0d028a71c444576c7e078a5c4c0d2fc24ae7c42b7cf8b6c50d024051d
pdf-font-stream PDF embedded font (sfnt) at offset 0x3128 22292 bytes
font_01_sfnt_off000062e2.bin
d51241e89f4f338859be71f83b97d5113597b56e54ba95d5f0a17f8bb085cf48
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E2 19508 bytes