Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49de961dafb1da7…

MALICIOUS

PDF

45.5 KB Created: 2021-05-17 21:03:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4393ed652a81ede8a93c86ae351ecd00 SHA-1: 91e1b5225412b2f165f26e8ae71a25f1e9d6f670 SHA-256: e49de961dafb1da7573254ce9d90c2cce630697293008eceb54fb44268ee2a45
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a 'Secret Recovery' lure, indicating it likely attempts to phish for sensitive credentials. It also links to a game hack generator, a common lure for malware distribution. The embedded URL points to a suspicious domain, likely serving as the initial stage for a payload download or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/406889139/coin-master-hack-without-verification-2021-game-hack PDF link annotation
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/i-need-robux_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-wurst_GM479516143.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b71.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B71 24596 bytes
SHA-256: f9d5f2ccdf2f94179f8583bcd7ee61348c52d3cdac3d1d5767c54869e49f68c0
font_01_sfnt_off000083f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83F5 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE0 18756 bytes
SHA-256: 1f8069b8e373c1677ee696ae61803aee5e0941708a1ef93a03d88c08535d6ef3

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