Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5fa8a9c15c112f…

MALICIOUS

PDF

56.4 KB Created: 2021-06-11 04:33:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8a6d0919832561c2d5bea11e0985f943 SHA-1: 3ec2486b20e5bb9835ab6a74695d07aa431d4e4b SHA-256: 9b5fa8a9c15c112f962fe787bda616ae0e0c80f6c466ec8686ee49967269ca3d
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 0.9671

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.tw/app/431946152/how-to-hack-admin-in-roblox-games-game-hack PDF link annotation
    • http://foo.com.tw/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/code-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/tryrbx-site-free-robux_GM431946152.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_004_off0000521c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521C 33944 bytes
SHA-256: d644b0dcf54101112a6eed394d334b5a2dbfa4490f7129981f5a190a602e6e6d
font_01_sfnt_off00009d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D87 8376 bytes
SHA-256: 092b7a11ef2af93d0b61b37032e6f669359ea7bc5bcb682d43a712f599a5ca39
font_02_sfnt_off0000b856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB856 18900 bytes
SHA-256: 36bf918d783b82064697fe71b9fd691f34043880d2822af092e7868fe2bcef19

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