Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f0915e563f4c26…

MALICIOUS

PDF

42.1 KB Created: 2021-05-13 20:09:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7337cc8bc4498ee5209a7f2f133b8e32 SHA-1: 6118dcc7e771f3aa4a16ca2d36674e5057387dac SHA-256: 23f0915e563f4c26322a9f7d36f59ca23dc7fd7e6486fd15e31f73d886caee86
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body and extracted URLs indicate a lure for in-game currency hacks, a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/free-coins-coin-master-hack-game-hack
    • http://regioliga.pl/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • http://regioliga.pl/images/free-minecraft-maps_GM479516143.pdf
    • http://regioliga.pl/images/bloxpage-free-robux_GM431946152.pdf
    • http://regioliga.pl/images/coin-master-hack-apk-facebook-login_GM406889139.pdf
    • http://regioliga.pl/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • http://regioliga.pl/images/free-roblox-clothes-for-your-avatar_GM431946152.pdf
    • http://regioliga.pl/images/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • http://regioliga.pl/images/free-spins-coin-master_GM406889139.pdf
    • http://regioliga.pl/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://regioliga.pl/images/free-robux-offers_GM431946152.pdf
    • http://regioliga.pl/images/get-free-coins-on-coin-master_GM406889139.pdf
    • http://regioliga.pl/images/sites-to-get-free-robux_GM431946152.pdf
    • http://regioliga.pl/images/how-to-get-free-skins-on-coin-master_GM406889139.pdf
    • http://regioliga.pl/images/coin-master-332-apk-free-download_GM406889139.pdf
    • http://regioliga.pl/images/coin-master-hack-2021-ios_GM406889139.pdf
    • http://regioliga.pl/images/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://regioliga.pl/images/coin-master-free-spins-link-2021-no-verification_GM406889139.pdf
    • http://regioliga.pl/images/minecraft-hack-app_GM479516143.pdf
    • http://regioliga.pl/images/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • http://regioliga.pl/images/free-robux-no-verification-required_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000496a.bin
b62f380cc11c5070cb8432eed45011835a74928d07855a7369cc26ef7e522dee		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x496A 25836 bytes
font_01_sfnt_off00008364.bin
d4b290fbe96f806a63e53895600235ad07ee700a50234ed47d5e5eeda0b1e0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8364 17880 bytes

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