Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e8421fe0daa3fa…

MALICIOUS

PDF

41.5 KB Created: 2021-05-16 00:06:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4a4898da6973d751a32e153904638aa1 SHA-1: 23acf65632d90626f7ce276892f7b5c745412dbb SHA-256: 52e8421fe0daa3fa0eeec340dec566d178c441fc105d865f848c6142710a96b0
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are SEO-optimized slugs pointing to sites offering game hacks and cheats. One prominent URL, https://netcdn.xyz/app/479516143/wurst-1.15-2-game-hack, suggests a download lure for potentially unwanted or malicious software. The ML classifier also flagged this PDF as malicious with high confidence.

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/479516143/wurst-1.15-2-game-hack
    • http://gops.pruszczgdanski.pl/images/free-spins-for-coin-master-2021_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/easy-coin-master-hack-without-verification_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/coin-master-free-food-for-pet_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/coin-master-spins-and-coins_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/free-roblox-avatar-ideas_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/free-online-generator-for-coin-master_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/coin-master-apk-hack-2021_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/100-free-coin-master-spins_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/roblox-bux-free_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/free-executor-roblox_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/earn-robux-websites_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/coin-master-spin-hack-trick_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/bux-life-free-robux_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/apps-to-get-free-robux_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/free-coins-on-coin-master-2021_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/minecraft-114-4-download_GM479516143.pdf
    • http://gops.pruszczgdanski.pl/images/how-to-hack-someones-minecraft-account_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048fc.bin
61d06582fe5383c0196b340ed9a083eefb23f81468ed583f12b4e31dd4a8db4e
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48FC 24516 bytes
font_01_sfnt_off000080c0.bin
94ec895cad4eeca7e3e8945795636ab9bfa2b0222484f596d6ff7da1964e26b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x80C0 17988 bytes