Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d78787e791325b9…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 21:27:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6ae4532878048485c3dabf4df3d2d99b SHA-1: bbc104d3be8130d42e473bfb51d36c897b4126a1 SHA-256: 3d78787e791325b921cf8d83751c7b04411a35f06e40c173f8ba62885be515d2
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.tw/app/406889139/2021-free-spins-coin-master-game-hack PDF link annotation
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/roblox-how-to-make-face-free_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/games-on-roblox-that-have-free-boombox_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/monttechscom-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-make-a-free-admin-game-on-roblox_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/roblox-robux-hack-2021-easy_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/roblox-free-robux-no-password-for_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-ipad-mini-2021_GM431946152.pdfIn PDF document text
    • https://kab-gianyar.kpu.go.id/new/public/ckfinder/userfiles/files/bux-life-free-robux_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_off000032c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C0 23200 bytes
SHA-256: 1e368c91f3c85cfc1ae7450b0d58a22cc9f216ea371d53114aa9d936e1ed4d88
font_01_sfnt_off000066e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E7 18576 bytes
SHA-256: e072abe3ddea7348b6ad42f3e58cf0336d8cc97c01862fb082958ccb0059bec3

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