Malicious PDF — malware analysis report

Static analysis result for SHA-256 246c74360a3d6897…

MALICIOUS

PDF

35.4 KB Created: 2021-06-20 21:17:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9109c4980c3790b213b42ff0c33fdde0 SHA-1: aa8db548cce0249e9599d5b52d7c869f082e6f1e SHA-256: 246c74360a3d68971dd170e8b72d4fb4ba1d7f1815a86955487749b98f2aa5a2
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 0.9980

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 http://netcdn.co/app/431946152/password-free-roblox-accounts-game-hack PDF link annotation
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-bobux_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/gaming-tutorials-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-capes-no-mods_GM479516143.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_off0000311f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x311F 22792 bytes
SHA-256: a01723b9ad057d2cb1c794bda2a90f3b741660edd9a56c20b857bf1342c96a98
font_01_sfnt_off0000645b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645B 19384 bytes
SHA-256: 03117f35e26f952280f1a86eaf9dd12b6f6c2ed6461e2b7a08b69775d2729496

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