Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd455e65ac02db23…

MALICIOUS

PDF

35.4 KB Created: 2021-06-29 16:47:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f1dc2392985ae91a3538f26c5027b50e SHA-1: 973a4709dc858e92434a6eec2c797a983159e94b SHA-256: cd455e65ac02db2372d791b93693d908d7cd14cc55a75044256c780b17c567ad
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are structured as SEO link farms, suggesting an attempt to drive traffic to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a download button lure further support a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of 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/how-to-hack-granny-roblox-game-hack
    • http://perpustakaan.pa-dompu.go.id//repository/robux-generator-com_GM431946152.pdf
    • http://perpustakaan.pa-dompu.go.id/repository/insane-jailbreak-roblox-admin-panel-hack-working_GM431946152.pdf
    • http://perpustakaan.pa-dompu.go.id//repository/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://perpustakaan.pa-dompu.go.id/repository/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdf
    • http://perpustakaan.pa-dompu.go.id//repository/roblox-gang-rape_GM431946152.pdf
    • http://perpustakaan.pa-dompu.go.id//repository/free-robux-generator-without-human-verification_GM431946152.pdf
    • http://perpustakaan.pa-dompu.go.id//repository/online-hacking-tricks-coin-master_GM406889139.pdf
    • http://perpustakaan.pa-dompu.go.id/repository/roblox-dungeon-quest-no-skill-coulddown-script-hack_GM431946152.pdf
    • http://perpustakaan.pa-dompu.go.id/repository/free-roblox-stuff-2021-promocodes_GM431946152.pdf
    • http://perpustakaan.pa-dompu.go.id/repository/coin-master-email-rewards-link_GM406889139.pdf
    • http://perpustakaan.pa-dompu.go.id/repository/descargar-roblox-hack-robux-para-pc_GM431946152.pdf
    • http://perpustakaan.pa-dompu.go.id//repository/how-to-hack-coin-master_GM406889139.pdf
    • http://perpustakaan.pa-dompu.go.id//repository/coin-master-viking-quest-hack_GM406889139.pdf
    • http://perpustakaan.pa-dompu.go.id//repository/roblox-free-robux-no-verification_GM431946152.pdf
    • http://perpustakaan.pa-dompu.go.id/repository/free-coin-master-cards_GM406889139.pdf
    • http://perpustakaan.pa-dompu.go.id//repository/roblox-hacked-com-2021_GM431946152.pdf
    • http://perpustakaan.pa-dompu.go.id/repository/how-do-you-hack-roblox_GM431946152.pdf
    • http://perpustakaan.pa-dompu.go.id/repository/coin-master-free-spins-app_GM406889139.pdf
    • http://perpustakaan.pa-dompu.go.id//repository/free-minecraft-servers-to-join_GM479516143.pdf
    • http://perpustakaan.pa-dompu.go.id/repository/roblox-scripts-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032b8.bin
1bae9daeb61c245c84bdbc73354825dfc007c984ccb3a0d5287dfb3dd5fccca5
pdf-font-stream PDF embedded font (sfnt) at offset 0x32B8 22616 bytes
font_01_sfnt_off0000653c.bin
19ee2d1c8c8e9d658c77d56bdc1a0e84a2a4415826777fe86e783f2c7591db5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x653C 19000 bytes