Malicious PDF — malware analysis report

Static analysis result for SHA-256 050c8fc8f1453009…

MALICIOUS

PDF

41.2 KB Created: 2021-05-19 23:06:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4cccb40da15973b58fdab820bad6071b SHA-1: c65203d4d053a8371b9ae6167ea535cb17a7e095 SHA-256: 050c8fc8f1453009f2c24ac7f17f3ac0c0bca812b0d22f51158f58d8811fae1c
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 0.9971

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/1330123889/pubg-uc-number-game-hack PDF link annotation
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-game_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coinmaster_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-hack-no-human-verification_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_off00004887.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4887 23936 bytes
SHA-256: 54cded334b18892a98ca7e9a26472c3804024c10e5b2b85aedcdaacce8c7c838
font_01_sfnt_off00007efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFA 18156 bytes
SHA-256: b40f7278a10c47a9d702e8abbbc6acc031d284f14642544d259b49416ed87b59

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