Malicious PDF — malware analysis report

Static analysis result for SHA-256 6119105ef489c0cb…

MALICIOUS

PDF

43.0 KB Created: 2021-05-16 05:03:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e51db73ddc88e050a0575e715e979742 SHA-1: 9136351f3027b94aba693b71553b7d4b37c3e238 SHA-256: 6119105ef489c0cba862f49fa66dcf2cee5b07eab1503f3b27130a123819f2ff
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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.xyz/app/431946152/how-to-hack-roblox-2021-game-hack PDF link annotation
    • https://kojak-group.com/userfiles/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-hack-someones-roblox-account_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_003_off00004965.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4965 25328 bytes
SHA-256: 73734520c81dd40294364f219648b4f1ff8baff7f30c260c86c8198e48e68be5
font_01_sfnt_off00008209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8209 19400 bytes
SHA-256: a82460b0f3ae37fddacbe5926a5257b96b86c980854f226fefa18755facf9a17

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