Malicious PDF — malware analysis report

Static analysis result for SHA-256 92337f59c65e86c6…

MALICIOUS

PDF

33.9 KB Created: 2021-07-03 22:48:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: be4973d96ee264a631967e6efd2c8f44 SHA-1: e8f9fdc961b0ec18d9ce236ea1a517a9230d9ef5 SHA-256: 92337f59c65e86c6c9b0d3e2ae5cafef0b2dee00de9d7d3921c658d69908f523
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to websites offering game cheats and in-game currency, such as 'free-spin-link-of-coin-master-game-hack'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users with promises of cheats. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the document body and heuristics strongly indicate a lure for potentially malicious websites.

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/free-spin-link-of-coin-master-game-hack
    • https://www.donjastubica.hr/files/roblox-kick-ban-hack_GM431946152.pdf
    • https://www.donjastubica.hr/files/how-to-get-free-robux-for-free_GM431946152.pdf
    • http://www.donjastubica.hr/files/what-is-coin-master-app_GM406889139.pdf
    • https://www.donjastubica.hr/files/200-free-spins-coin-master_GM406889139.pdf
    • https://www.donjastubica.hr/files/free-daily-spins-from-coin-master_GM406889139.pdf
    • https://www.donjastubica.hr/files/how-many-levels-does-coin-master-have_GM406889139.pdf
    • http://www.donjastubica.hr/files/pro-pubg-xyz-uc-hack_GM1330123889.pdf
    • http://www.donjastubica.hr/files/how-to-get-free-robux-no-verification_GM431946152.pdf
    • http://www.donjastubica.hr/files/coin-master-hack-app-android_GM406889139.pdf
    • http://www.donjastubica.hr/files/free-robux-no-human-verification-or-download-or-survey_GM431946152.pdf
    • https://www.donjastubica.hr/files/bexggg-free-robux_GM431946152.pdf
    • http://www.donjastubica.hr/files/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdf
    • http://www.donjastubica.hr/files/coin-master-hack-pro-gamers_GM406889139.pdf
    • https://www.donjastubica.hr/files/roblox-girl-avatar_GM431946152.pdf
    • https://www.donjastubica.hr/files/sword-fighting-roblox-game-free-to-copy_GM431946152.pdf
    • http://www.donjastubica.hr/files/daily-spins-coin-master_GM406889139.pdf
    • http://www.donjastubica.hr/files/coin-master-game-hunter_GM406889139.pdf
    • http://www.donjastubica.hr/files/how-to-get-free-robux-without-waiting_GM431946152.pdf
    • http://www.donjastubica.hr/files/free-unused-roblox-toy-codes_GM431946152.pdf
    • http://www.donjastubica.hr/files/robux-hacking-website-no-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e03.bin
8550b84e5ef4ee87047ffd572acc42523edaae0dc7515557b0b4044296eb19b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x2E03 22880 bytes
font_01_sfnt_off0000618f.bin
0f2d33dda11e71189f765515efb7c5f5639061ef869ee1e05892dc19524cfbd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x618F 18344 bytes