Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13626e82a78f92d…

MALICIOUS

PDF

54.8 KB Created: 2021-05-12 12:03:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8b248b4eda26d8df4815530cd364ec94 SHA-1: 209f592d09ce8af1cc95bbb157273b94d59a7e08 SHA-256: c13626e82a78f92d8ecd1996e07931c9a99d2399aadcb7b67140acfa0deb93c2
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 related to game hacks and free in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to direct users to potentially harmful sites. The ML classifier also flagged this PDF as malicious with a high probability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8324

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.xyz/app/406889139/coin-master-free-spins-only-game-hack
    • https://lib.btkljogja.or.id/repository/buy-robux-free_GM431946152.pdf
    • https://lib.btkljogja.or.id/repository/how-to-hack-coin-master-without-root_GM406889139.pdf
    • https://lib.btkljogja.or.id/repository/coin-master-games-hack_GM406889139.pdf
    • https://lib.btkljogja.or.id/repository/minecraft-pe-server-hosting-free_GM479516143.pdf
    • https://lib.btkljogja.or.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://lib.btkljogja.or.id/repository/free-minecraft-maps-pe_GM479516143.pdf
    • https://lib.btkljogja.or.id/repository/free-robux-websites-that-actually-work_GM431946152.pdf
    • https://lib.btkljogja.or.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • https://lib.btkljogja.or.id/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdf
    • https://lib.btkljogja.or.id/repository/free-coin-master-spin-and-coin-link_GM406889139.pdf
    • https://lib.btkljogja.or.id/repository/robux-codes-generator-no-human-verification_GM431946152.pdf
    • https://lib.btkljogja.or.id/repository/coin-master-free-spins-and-coins-app_GM406889139.pdf
    • https://lib.btkljogja.or.id/repository/can-you-get-minecraft-for-free-on-pc_GM479516143.pdf
    • https://lib.btkljogja.or.id/repository/coin-master-hack-mod-apk-download_GM406889139.pdf
    • https://lib.btkljogja.or.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdf
    • https://lib.btkljogja.or.id/repository/can-lucky-patcher-hack-coin-master_GM406889139.pdf
    • https://lib.btkljogja.or.id/repository/free-robux-group-payouts_GM431946152.pdf
    • https://lib.btkljogja.or.id/repository/how-to-free-robux_GM431946152.pdf
    • https://lib.btkljogja.or.id/repository/roblox-free-robux-no-verification_GM431946152.pdf
    • https://lib.btkljogja.or.id/repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae0.bin
f7f2317bc62eeb6198d2c50b09a49a892756f930f3d864f02d7510ab8a303031		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE0 26088 bytes
font_01_sfnt_off000087dd.bin
e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87DD 3088 bytes
font_02_sfnt_off000092a8.bin
cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92A8 7960 bytes
font_03_sfnt_off0000a5ce.bin
e8323280cfa25f0840c1e0ad6f99419943ef2c7379aa1851e8b4a739432d5c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5CE 18140 bytes
font_04_sfnt_off0000c75c.bin
fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 4272 bytes

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