Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8018e50932849f6…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 21:04:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5332999044a0004321a70e10ec40f38b SHA-1: ade5bb1b748a54dbd47f670f1ae3226cbb9be0a5 SHA-256: b8018e50932849f642ca74e1023a4c5bdf450baf182161bc4c332575abd0394a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a prominent link to a 'game hack' lure, which is a common tactic for distributing malware or leading users to phishing sites. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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 https://netcdn.online/app/431946152/roblox-got-talent-piano-hack-game-hack PDF link annotation
    • https://kojak-group.com/userfiles/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D0 25040 bytes
SHA-256: 1b5b880b0d299529fe2064b52229c181cb8667883b926da198ec9f711ff43921
font_01_sfnt_off00008a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A85 2824 bytes
SHA-256: 45bf821f81e84f4aa8d8374f492b182b36404f38b462c7dc471deaad6ab5c104
font_02_sfnt_off00009433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9433 18560 bytes
SHA-256: 718cc2b062ab6cfaeb2a411bf3639d4ddcb64813a44b35fc4dc4c297fc3c3153

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