Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6dc133b0c23e93…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 22:43:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4d90e41953aa3cb66b1983cfc15bba35 SHA-1: 09aa615365a68462086f460a05a73eaa3b54c34d SHA-256: 2a6dc133b0c23e9309075013e04065929126f38c9c1c3911b3040320fba3b9c3
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are SEO-optimized to appear as legitimate offers for game hacks and currency. The primary heuristic indicates a link farm designed to redirect users to potentially malicious sites. The document body and heuristics suggest a lure for free in-game items, which is a common social engineering tactic.

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-free-coins-link-game-hack
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-roblox-hack-us_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-robux-no-human-verification-2021-ipad_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/hack-level-zombie-rush-roblox_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coin-master-unlimited-spin-hack_GM406889139.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/join-roblox-builders-club-free_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-in-2021_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/toolbox-for-minecraft-pe-ios_GM479516143.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/super-simon-says-hack-roblox-espaol_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/cheat-roblox-v3rmillion_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coin-master-32-android-mod-hack-apk-download_GM406889139.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/minecraft-gun-games-free_GM479516143.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/minecraft-mod-menu-apk_GM479516143.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/minecraft-bedrock-edition-free_GM479516143.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/op-rewards-robux_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/is-hacking-robux-impossible_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/roblox-admin-hack_GM431946152.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdf
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/how-do-we-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032ed.bin
98efc01c7c05e850a2c9721b91fe5db12bff35a2d1567dee84e77b890b847817
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32ED 23288 bytes
font_01_sfnt_off0000672b.bin
7e3864b359ae4e20f98f554aea3d5366a72fce57ca0fb6405be6acd76bdcbaac
pdf-font-stream PDF embedded font (sfnt) at offset 0x672B 18168 bytes