Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ba7c83dfcc8d99…

MALICIOUS

PDF

35.0 KB Created: 2021-06-22 07:57:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a42ce5579724af105f7b999b9bbca343 SHA-1: f629cc141bbef6258128fedc84eda5955aff8421 SHA-256: 86ba7c83dfcc8d9924ff720cf0ce45c949b16c3a29505974cc7dced5818178e5
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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/406889139/coin-master-free-spins-hacktman-game-hack PDF link annotation
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/piano-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-person_GM431946152.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-peters-alton.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-com-hack_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_002_off00003209.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3209 22960 bytes
SHA-256: 47bf65de1b9d25b248b187d29a0c867e3a0408efaf71b852c0078b2c64797e14
font_01_sfnt_off00006545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6545 18604 bytes
SHA-256: 4bdfeca594628802d69067d6b2f20385009c2d8f96afc7f272a39be84923808b

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