Malicious PDF — malware analysis report

Static analysis result for SHA-256 638b53153c8f1463…

MALICIOUS

PDF

49.5 KB Created: 2021-05-15 22:18:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e38be78b1af923837980a7b085289b32 SHA-1: c7d2f57a74ad06282f947d2df184277483f691bf SHA-256: 638b53153c8f146308fb77cf9c05046d5703ef1235dc116ce0223c625ad59adf
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a link farm heuristic firing, indicating a strong attempt to redirect users to external sites. The document body and extracted URLs suggest a lure related to 'free Robux' and 'Coin Master' game cheats, which is a common tactic for phishing and scam operations. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

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/free-robux-codes-2021-game-hack
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/coin-master-club-hack_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/coin-master-hack-tool-apk-download_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-hack-tool-for-pc_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/free-spins-from-coin-master_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/roblox-hackers-list_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/coin-master-free-spons-apk-2021_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/coin-master-free-cards-hack_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/is-minecraft-bedrock-free_GM479516143.pdf
    • http://lib.uho.ac.id/library//repository/coin-master-apk-hack-mod-download_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/how-to-get-free-things-on-roblox_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/free-coin-master-spin-generator_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/how-to-get-free-admin-in-roblox_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/roblox-controversy_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-email-rewards-link_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-hack-2021-app-download_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/is-roblox-free-on-ps4_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/get-free-spins-coin-master-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d79.bin
c83e0a52c2362654f7087017e668ebbcbc4e2d66819e255a2c411886b250de37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D79 25044 bytes
font_01_sfnt_off00008761.bin
552e62132cae3603ce0819827e44d96a992bd06014cc5080bf3af4b2ea155b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8761 2880 bytes
font_02_sfnt_off00009135.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9135 5596 bytes
font_03_sfnt_off00009ddd.bin
0c0011b59677f21f59199ad7d2a82948105ed154610022cedcbab6f052c91d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DDD 18588 bytes

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