Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f8430a6d623c2c…

MALICIOUS

PDF

42.3 KB Created: 2021-05-16 16:36:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 408ed8420a957c2a98ae8cb39cddebb0 SHA-1: ca6b30c2ea49e936c0d068f75cd40a0c84fe0381 SHA-256: b9f8430a6d623c2c85a88293766efa0d4eec22b3541494e8c2861cee504dd588
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The document body and extracted URLs indicate a lure for free in-game currency or hacks, likely leading to a malicious download or exploit. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/431946152/lazyblocks-com-free-robux-game-hack
    • http://ratchadatitan.com/UserFiles/File/2021-free-spins-coin-master-link_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/coin-master-mod-free-download_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/roblox-hack_GM431946152.pdf
    • http://ratchadatitan.com/UserFiles/File/free-coin-spin-daily-link-net_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/coin-master-raid-hack_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/how-to-hack-any-roblox-account_GM431946152.pdf
    • http://ratchadatitan.com/UserFiles/File/free-roblox-followers-generator-2021_GM431946152.pdf
    • http://ratchadatitan.com/UserFiles/File/free-400-spins-coins-master_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/coin-master-sound-daily-free-spins-link-today_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/free-coin-coin-master_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/roblox-free-online-game_GM431946152.pdf
    • http://ratchadatitan.com/UserFiles/File/daily-free-spins-for-coin-master_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/free-robux-2021_GM431946152.pdf
    • http://ratchadatitan.com/UserFiles/File/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • http://ratchadatitan.com/UserFiles/File/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://ratchadatitan.com/UserFiles/File/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdf
    • http://ratchadatitan.com/UserFiles/File/how-to-get-free-premium-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000476f.bin
8ec28cff52c2cb67f406d37101398be4d04eedd2b7969f9afc04db63af9d2ef3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x476F 25200 bytes
font_01_sfnt_off000080ad.bin
000d85757c2dbc774c4a4ed19607b9025a632ba167ee8131c5b8e6d7f50f0f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AD 19008 bytes

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