Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89b0729f80871b1…

MALICIOUS

PDF

35.5 KB Created: 2021-06-28 04:22:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f6cca13ce643f51fa74c1d215e8831f3 SHA-1: ae7da5068501fff26f77232359d2c36d64a8c505 SHA-256: c89b0729f80871b12ec97d47e9681955fea3a19fd8bb945fc40467d995185097
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a prominent call-to-action related to obtaining free Robux, indicating a phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of links were generated, likely for SEO manipulation to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/codepour-free-robux-game-hack
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-robux-using-edit-this-cookie_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-50-robux-card-code_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-roblox-on-xbox-one_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-robux-codes-on-tablet-2021_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/twitter-coin-master-free-spins-link_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-can-i-hack-roblox_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/erased-citizen-roblox-hack-how_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/coin-master-blogspot_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-roblox-accounts-2021_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/vasilis-roblox-hack-exe_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-robux-accounts_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/master-coin-master-free-spin_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-robux-by-bananaman-world_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-robux-2021-no-inspect_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/kachifpro_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/robux-hack-no-verification-human_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/tycoon-hack-roblox_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-hack-roblox-games-ios_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003308.bin
1fa57f445099b1d62858a2081a6bcc5aa40e77dfd64c363244930dd09af7061b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3308 22720 bytes
font_01_sfnt_off000065e2.bin
c595ffd6cc5a7b31df36bd34fee04b7b8157bb0b8525b0a13ceb39d38d8d5955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E2 19068 bytes

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