Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07d64b9152898a8…

MALICIOUS

PDF

35.1 KB Created: 2021-06-26 16:43:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f5e510ef771741b41713ac943a10a542 SHA-1: ae5643a83c1408e35886ac8502565de8d362862c SHA-256: a07d64b9152898a8a818d024ff0cc95de4021db416b77643d0736a07b27275e9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links and a specific URL pointing to 'roblox-free-items-list-game-hack', suggesting a lure for users seeking game-related cheats or currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are related to game hacks, further supporting this malicious intent. The ML classifier also flagged this PDF as malicious with high confidence.

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-free-items-list-game-hack
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/ways-to-get-free-robux_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-coin-master-hack_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-hack-spin-ios_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-printable-roblox-images_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-do-i-get-robux-on-roblox_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-with-no-human-verification_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-claim-spins_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/hack-de-coin-master_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/official-coin-master-free-spins_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-swearing-hack_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-daily-free-cards_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/pokemon-go-free-account-2021_GM1094591345.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-no-human-verification_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/20210-free-spin-links-for-coin-master_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/tiktok-free-on-google_GM835599320.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-minecraft-hosting_GM479516143.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/totally-free-coin-master-spins-2021_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-arsenal-hacks-download_GM431946152.pdf
    • https://www.roblox.com/my/tasks
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003146.bin
1ac06f4317aaef097d88ee0dffd5e4c1b0e5963a76c3d8c8029d3a7cc6a4727f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3146 22652 bytes
font_01_sfnt_off000063d7.bin
40d46898f0223d554727f04a044cf68c45d74e0ea6356c04eaa9cddf9e142644		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D7 19132 bytes

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