Malicious PDF — malware analysis report

Static analysis result for SHA-256 b897f1f8fee9caf2…

MALICIOUS

PDF

34.9 KB Created: 2021-06-27 07:22:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1b1eba01052d755a0f7623e1c0ce7ec7 SHA-1: bd12cbceeb3e77af1f08e44c95fab5bfadea43f3 SHA-256: b897f1f8fee9caf259f207a737d20f8438108cd9f50f69fe4cb5d457d2ab4ebe
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, primarily related to game hacks and exploits for Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm designed to attract users searching for cheats. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the document's content strongly suggest a phishing or malware distribution attempt.

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/sulavan-hacked-my-acount-on-roblox-game-hack PDF link annotation
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/free-robux-sans-verification-humaine_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/autofarm-hack-roblox-pjj_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/cheat-roblox-jailbreak-2021-tp-unpatched-may-2021_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/roblox-how-to-hack-gravity-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/new-roblox-hack-script-execution_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/roblox-gift-free-robux_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-retail-tycoon_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/roblox-robux-generator-no-hack_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/how-to-hacker-roblox-for-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/roblox-first-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/money-hack-sur-sunset-city-roblox-2021_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/free-robux-promo-codes-2021-july_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/roblox-hack-pastebin-all-games_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-into-other-accounts-on-roblox_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/hack-two-factor-authentication-roblox_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-slx-roblox_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/roblox-hack-apk-android-2021_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/free-draw-2-alpha-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3142 22036 bytes
SHA-256: 777b37223980b3a6d506bbdd471f3ba6875227350d87835a404f6b78310471bd
font_01_sfnt_off000061ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AD 19564 bytes
SHA-256: 6df482d7de256266722e84a46d7f0c5603e93a04b2a2f41ec83c43700bdc5bcc

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