Malicious PDF — malware analysis report

Static analysis result for SHA-256 d736fcc10a9e3a19…

MALICIOUS

PDF

46.1 KB Created: 2021-06-09 16:50:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7c0b035a199c2d18f7830afeb6d333ae SHA-1: b9312521c7a374fc76368a3d1943f019cabdb31f SHA-256: d736fcc10a9e3a19210a7bd0977080934db336a444d52bbebbb8821b93556e57
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are structured as SEO-optimized PDF link farms. The document body and extracted URLs suggest a lure for game-related cheats and hacks, indicating a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-guess-the-famous-characters-answers-cheat-sheets-game-hack
    • http://grupodin.com.br/images/minecraft-free-computer-game_GM479516143.pdf
    • http://grupodin.com.br/images/coin-master-app-for-free-spins_GM406889139.pdf
    • http://grupodin.com.br/images/free-robux-hack-no-survey-no-password-for-real_GM431946152.pdf
    • http://grupodin.com.br/images/roblox-theme-park-tycoon-2-cheat-codes_GM431946152.pdf
    • http://grupodin.com.br/images/free-robux-it-meme_GM431946152.pdf
    • http://grupodin.com.br/images/free-to-use-old-roblox-accounts_GM431946152.pdf
    • http://grupodin.com.br/images/get-free-likes-on-tiktok_GM835599320.pdf
    • http://grupodin.com.br/images/coin-master-ultra-attack-hack_GM406889139.pdf
    • http://grupodin.com.br/images/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • http://grupodin.com.br/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • http://grupodin.com.br/images/free-robux-hacks-new-2021_GM431946152.pdf
    • http://grupodin.com.br/images/coin-master-hack-ios-no-human-verification_GM406889139.pdf
    • http://grupodin.com.br/images/how-can-someone-hack-roblox-account-frim-discord_GM431946152.pdf
    • http://grupodin.com.br/images/coin-master-gift-hack_GM406889139.pdf
    • http://grupodin.com.br/images/robux-hack-android_GM431946152.pdf
    • http://grupodin.com.br/images/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • http://grupodin.com.br/images/roblox-free-robux-website_GM431946152.pdf
    • http://grupodin.com.br/images/free-coin-master-spins-2021_GM406889139.pdf
    • http://grupodin.com.br/images/free-robux-inspect-element-2021_GM431946152.pdf
    • http://grupodin.com.br/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051cd.bin
343e82b50fb41fdd6c3b36735b7f20728b307f929e0410b8b81aeb92885946a3
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51CD 27640 bytes
font_01_sfnt_off00008f6f.bin
c189edbaf02c0f3e30f93885a19fa0b91891b19fa0a94cca71b6026a2c4e9cea
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6F 19008 bytes