Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ff71e66a2e502c…

MALICIOUS

PDF

51.9 KB Created: 2021-06-04 02:56:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 66c7e685212736e876fbafc78dc084f5 SHA-1: 64d01b31b9edb730c8dbabdb7bca14bcc8de014a SHA-256: b6ff71e66a2e502c5f9d4dd08659cfc5ff336b527c0e49e515fcbb12a6187bcd
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 0.9657

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.online/app/431946152/free-robux-redeem-codes-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-earn_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f4b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F4B 25984 bytes
SHA-256: dc5c8e39c05fa3692380cb87feddb55c3b863c026c004bba63784d55feae466b
font_01_sfnt_off0000890c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x890C 3884 bytes
SHA-256: 64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29
font_02_sfnt_off000095af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95AF 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_03_sfnt_off0000a792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA792 18448 bytes
SHA-256: ac1fbd71dc65d7a5013a2beb110170fe519d7ae17df877d161357825f85fd2ae

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