Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb437c55c469bf42…

MALICIOUS

PDF

35.8 KB Created: 2021-06-25 07:21:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4f1f0fe1cf97fb55227183eaeb1c6721 SHA-1: 8a2ed26ee11a1f93dde958fe2cd886f1a9458c61 SHA-256: cb437c55c469bf42a61ca026009e21da67fec978d96bb57757fb8b0b2ae84b9c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that explicitly advertises "Free Robux" and "Game Hack" to entice users. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML_NYX_PDF_MALICIOUS classifier also flagged the document with high confidence.

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/get-free-robux-with-no-survey-game-hack PDF link annotation
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/roblox-mod-oder-hack-new-version-apk_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/how-to-get-free-robux-on-roblox-2021-no-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/royale-high-roblox-outfit-hacks_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/how-to-buy-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/how-to-get-free-private-servers-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/free-1-million-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/prison-life-vending-machine-gives-free-robux-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/free-robux-giveaway-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/currency-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/appstore-free-roblox-for-computer-game_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/hack-that-thing-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/how-to-hack-roblox-mad-games_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off0000324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324A 22716 bytes
SHA-256: 5b2ad73f7b2152efc969498a07ac31fb066c671d54d4963c6cfd1999b086dc7c
font_01_sfnt_off0000654f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654F 19600 bytes
SHA-256: 8b3d2b785acf1be549a8f1147ecd0f02c4391a3392e5dc6f70a367181e4bd162

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