Malicious PDF — malware analysis report

Static analysis result for SHA-256 f583753ec4fc4875…

MALICIOUS

PDF

43.5 KB Created: 2021-05-14 02:00:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f2b1ac14122532dcd77bf7286730023d SHA-1: 005ff24ba6fe6948c4ddf68509eff3cb0062008f SHA-256: f583753ec4fc48755d8dd3ab50356320c18fd7b20bb8304781d2045f74443ad5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to websites that promise free in-game items like Robux and Coin Master spins. The ML_NYX_PDF_MALICIOUS classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'free Robux' and a URL, reinforcing the scam lure. The presence of external URIs suggests the document is designed to redirect users to potentially malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-no-survey-game-hack
    • https://www.dc-itsolutions.com/userfiles/files/minecraft-skins-download-free_GM479516143.pdf
    • https://www.dc-itsolutions.com/userfiles/files/get-free-lives-on-coin-master_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/games-that-give-free-robux_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/robux-apk_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-online-hack-download_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/free-spins-on-coin-master_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/how-to-get-unlimited-robux-2021_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-cheats_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/minecraft-bedrock-hacks_GM479516143.pdf
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-apk-hack-2021-ios_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-free-spins-and-coins-hack_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/robloxheroxyz-free-robux_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/114-4-hacks_GM479516143.pdf
    • https://www.dc-itsolutions.com/userfiles/files/minecraft-items_GM479516143.pdf
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-no-human-verification-or-survey_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/minecraft-multiplayer-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b52.bin
bebf07b6a0fa3ad17dd05a9a45b6fc14afe8b881dd23a0a937cc82b578fd3043
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B52 26808 bytes
font_01_sfnt_off000086e6.bin
4e9b11cd56806b44a111e59337afa2364f0ba527e2b4797dd95234ca7f902292
pdf-font-stream PDF embedded font (sfnt) at offset 0x86E6 18576 bytes