Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b3a0a402abfcf2…

MALICIOUS

PDF

36.5 KB Created: 2021-07-03 19:01:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5b1964d24879fb8cc58da681900a9d7a SHA-1: 642130906740ee1c615c84bb096b6f185676c6a8 SHA-256: 57b3a0a402abfcf2f69dec28ce7e43f9b2391efce2245650e0dba3fe949d85b2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm, strongly suggesting a phishing or malware distribution attempt. The document body and extracted URLs explicitly mention game hacks, indicating a lure for users seeking cheats or exploits. 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.tw/app/406889139/coin-master-hack-2021-game-hack
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/minecraft-games-online-free-no-download_GM479516143.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-minecraft-hosting-24-7_GM479516143.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-buy-things-in-game-for-free_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-free-things-in-robux-inspect_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/robloxhacks_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-hack-exe_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/is-coin-master-hacks-safe_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-robux-for-free-2021-easy_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/cool-free-outfits-roblox_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/what-is-coin-master-app_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-speed-hack_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/minecraft-pe-free-ios_GM479516143.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-ipad_GM431946152.pdf
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-edit-leaderboard-cheats-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000036db.bin
92171e03fd4324988d05f32cc7a9e7bdfd0ab53d15f91e6f37f94920c3a417df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x36DB 23364 bytes
font_01_sfnt_off00006bbe.bin
8438728008f6ab05b5c9a65d4eeb1f2e5c23a436eadc11c6e76328f72b7d7fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBE 18408 bytes

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