Malicious PDF — malware analysis report

Static analysis result for SHA-256 823df75a894f521f…

MALICIOUS

PDF

35.6 KB Created: 2021-06-27 19:10:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a99f3e91213a0a2077e8828eb9e9f98c SHA-1: 01a2b7e402359e3463a362abe5798879090551d1 SHA-256: 823df75a894f521fe92663031b0bb3b44d98d1b0d546c373c790ac732b87731b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links and a visual download button, masquerading as a game verification problem to trick users into clicking. The primary link, http://netcdn.co/app/431946152/roblox.game-hack.online-verification-problem-game-hack, is flagged as malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and malicious links strongly suggest an intent to redirect users to a site that likely hosts malware or engages in phishing. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 3

  • 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.
  • 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.game-hack.online-verification-problem-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-card-code-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-hack-explot_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-aimbot-hack-for-nerf-fps_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-btools-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/best-items-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-island-royale-hack-aimbot_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-do-get-free-robux-in-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
stream_002_off000031cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31CF 22676 bytes
SHA-256: 289dffda608f0c674a6cd49ef52f55b713dc0bde230323fd9493b97afb747dbb
font_01_sfnt_off0000646c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646C 19696 bytes
SHA-256: 97d128ab29edebc34176c1c6ccb1feeb5b39c7db3b6302bd305a84b94097affc

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