Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ed340dc2772e50…

MALICIOUS

PDF

35.3 KB Created: 2021-07-01 09:48:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: eaf517362b999d100b057f77d7696a33 SHA-1: 4ebf49936101734b40a5049d4fb49b596c25a6dc SHA-256: 75ed340dc2772e50953a24f53bf96cbd035cc16f39a550851cd3a450c13dbe6d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/help.com-free-robux-game-hack. The document body and numerous URLs suggest a lure related to obtaining free in-game currency or cheats for games like Roblox. The ML classifier also flagged this PDF as malicious 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/help.com-free-robux-game-hack In PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/multigame-aimbot-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/cringe-guys-trying-to-have-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/hacked-version-of-roblox-ios_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-roblox-bots-roblox-games_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-box_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/guess-that-song-roblox-cheat-sheet_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/a-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robux-verification-hack_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/justnow-freerobuxcodes2021working_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-shield_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-spielen-pc-free_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_off00003338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3338 22216 bytes
SHA-256: d45cf1c3b3978c11244836873749a995fe5fbc161cd0854667b2b8fbe04e166f
font_01_sfnt_off0000648d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x648D 19292 bytes
SHA-256: fcd9afbc9b1c8213e607b5c0c68a009c81a8edf866c23edfc812367ce6413ac3

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