Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdea7420b9b01bc6…

MALICIOUS

PDF

35.2 KB Created: 2021-06-20 04:02:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6aa3c15fd8f6e761993b7cd0ef41bbd0 SHA-1: 015710256752972589dd1b0225338f657e7a1fa0 SHA-256: fdea7420b9b01bc6dd7bbfe4a8f2b026d9c84762b729cd2bd8d199897c7af860
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a primary lure to 'http://netcdn.co/app/431946152/free-robux-no-human-verification-or-survey-2021-game-hack' under the guise of free Robux and game hacks. This is supported by heuristics indicating a redirector lure and a PDF link farm. The document's content and structure strongly suggest a phishing or scam attempt designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/free-robux-no-human-verification-or-survey-2021-game-hack PDF link annotation
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-neon-rideable-pet_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-fudz-five-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-admin-lua-script-hack_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/new-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-items_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-resource-packs_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_off00003121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3121 21968 bytes
SHA-256: 5975d4476109eeb502588385dad1fd2d17d05c877d899d31fc0085c165eb88d9
font_01_sfnt_off00006178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6178 20028 bytes
SHA-256: a686843967d16d630a3d792aecd0df7810ef9440d33d67b3fe7886ce86e787de

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