Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbacc38c8c9289e2…

MALICIOUS

PDF

50.3 KB Created: 2021-06-09 13:54:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5ea74632106994182cb2b381887ca0c9 SHA-1: b4b0e10d90a01867a0b80a45c858a50ddd6dfa81 SHA-256: cbacc38c8c9289e2331dbd676d7f6ae068fc4616c15f260ae60ed2c0e70225a2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier and contains a significant number of external links, many of which point to other PDFs. The document body and extracted links suggest a lure for game-related cheats or currency, such as 'free Robux', which is a common tactic for distributing malware. The presence of embedded URIs and the overall structure indicate an attempt to redirect users to malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9734

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/free-fast-robux-game-hack
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-link-ios_GM406889139.pdf
    • https://sunnygarden.com.tw/image/data/files/get-free-robux-without-human-verification_GM431946152.pdf
    • https://sunnygarden.com.tw/image/data/files/daily-free-spin-coin-master-link_GM406889139.pdf
    • https://sunnygarden.com.tw/image/data/files/www-coin-master-hack_GM406889139.pdf
    • https://sunnygarden.com.tw/image/data/files/minecraft-xbox-360-free-download-code_GM479516143.pdf
    • https://sunnygarden.com.tw/image/data/files/free-robux-gift-card-codes-2021_GM431946152.pdf
    • https://sunnygarden.com.tw/image/data/files/minecraft-java-edition-free-download_GM479516143.pdf
    • https://sunnygarden.com.tw/image/data/files/free-robux-games-that-actually-work_GM431946152.pdf
    • https://sunnygarden.com.tw/image/data/files/best-free-server-side-exploits-for-roblox_GM431946152.pdf
    • https://sunnygarden.com.tw/image/data/files/free-money-and-spins-coin-master_GM406889139.pdf
    • https://sunnygarden.com.tw/image/data/files/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdf
    • https://sunnygarden.com.tw/image/data/files/coin-master-gold-cards-hack_GM406889139.pdf
    • https://sunnygarden.com.tw/image/data/files/free-spins-coins-coin-master_GM406889139.pdf
    • https://sunnygarden.com.tw/image/data/files/new-free-spins-coin-master_GM406889139.pdf
    • https://sunnygarden.com.tw/image/data/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdf
    • https://sunnygarden.com.tw/image/data/files/free-minecraft-java-edition_GM479516143.pdf
    • https://sunnygarden.com.tw/image/data/files/claim-robux_GM431946152.pdf
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-game-download-mod-apk_GM406889139.pdf
    • https://sunnygarden.com.tw/image/data/files/coin-master-reward-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f1c.bin
9000bec5618bf903a2976f8d47281e83c81cc0b23eae7add9805e237f77d0fcc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F1C 25584 bytes
font_01_sfnt_off00008a75.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A75 2824 bytes
font_02_sfnt_off0000941f.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x941F 5696 bytes
font_03_sfnt_off0000a131.bin
ce2890f7dd5cbfda3a93aa50e86cc2e3b0cec2b308b591ec6afd52922d433f9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA131 18344 bytes

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