Malicious PDF — malware analysis report

Static analysis result for SHA-256 9613dd34fdaf38e9…

MALICIOUS

PDF

34.7 KB Created: 2021-06-29 02:13:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0c3a5a42a9f6f0822212accaeb0af3c5 SHA-1: ca7556a9fa397bacc60f26aa5c2a93fcc99a3d87 SHA-256: 9613dd34fdaf38e9ddec6ba72befae644668d23ea2f7a71e2d74872b54e19770
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on what appears to be a link farm, and one directly points to known malicious redirector infrastructure. The document body and extracted URLs suggest a lure for free in-game items or hacks for popular games like Roblox and Coin Master. The presence of a malicious redirector link indicates an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/roblox.com-free-kkk-k-k-k-k-m-k-game-hack In PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/pokemon-go-free-quickest-charge-moves_GM1094591345.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-get-free-robux-nicster_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/robux-come_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-roblox-gift-codes_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/games-like-roblox-but-free-and-no-download_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-change-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/robux-hack-install_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-get-free-coins-on-flip-master_GM406889139.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_off00003013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3013 22308 bytes
SHA-256: 2593291818970529bedd6c748a8b5701ef9cc0f7e82b2d990550dfb632389d92
font_01_sfnt_off000061c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C8 19344 bytes
SHA-256: 0d567608fb90e305ba1fd26dcebc5b03c2d984c5df3c6f7e98f1d9bcc354b74b

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