Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9c3244e72c90fb…

MALICIOUS

PDF

33.8 KB Created: 2021-07-09 23:12:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 66225ff030acb35b46a88c1e31419cb5 SHA-1: 2ac30ce92b2530d4c3c8d7820c8ef57d5551d3ae SHA-256: 7c9c3244e72c90fb5ac821b7b449e0322de66666fa3c5710a431027a2dbd96c9
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs related to game hacks and free items for popular games like Roblox and Coin Master. The presence of a direct link to 'netcdn.tw/app/...' suggests an attempt to direct users to download applications. The ML classifier also flagged this PDF as malicious with a high score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/431946152/free-roblox-adopt-me-pets-game-hack
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-332-apk-free-download_GM406889139.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-robux-website_GM431946152.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/i-need-robux_GM431946152.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/hacked-client-for-minecraft-bedrock_GM479516143.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-play-online-free_GM406889139.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-coin-master-spin-app_GM406889139.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/rbxoffers-earn-free-robux_GM431946152.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-spins-coins-coin-master_GM406889139.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/afraid-of-old-roblox-account-being-hacked_GM431946152.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/types-of-free-hair-on-roblox-not-model-for-girl_GM431946152.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-links-free-spins_GM406889139.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-roblox-like-bot_GM431946152.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-free-link-app_GM406889139.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/minecraft-pocket-edition-free-download_GM479516143.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-2021-robux_GM431946152.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/roblox-free-outfit-codes_GM431946152.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/how-to-get-free-cards-on-coin-master_GM406889139.pdf
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/roblox-robux-hack-generate-99999-robux-loladarnel_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d34.bin
fe3b8af2e1928015397480628b687a24fea4b6642bd11892fdfd700ffa2588d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D34 22024 bytes
font_01_sfnt_off00005dfc.bin
7b9be5883f45f02dbb03249ff61d9220e610f7b45a0bb0632252067c450821da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFC 19452 bytes

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