Malicious PDF — malware analysis report

Static analysis result for SHA-256 921da1a7f62346d7…

MALICIOUS

PDF

40.6 KB Created: 2021-07-06 20:09:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9b170e6e0901bfccdbc1d26548d3a89d SHA-1: 4d2f50d8ebc53bf8d4ab5193675ee157866b82f7 SHA-256: 921da1a7f62346d7c6e4ae42f9a72946965ad7e08d138cefffbc11f16f6a30ae
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 0.9659

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/479516143/minecraft-java-edition-free-code-game-hack PDF link annotation
    • http://hosoffices.com/ckfinder/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/how-to-play-roblox-on-itunes-for-free_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/dragon-ball-final-stand-roblox-hack-2021-may_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/roblox-hack-ingame_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/roblox-free-item-generator_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/roblox-contrasea-hack_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-toy-codes-roblox-2021_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/how-to-get-free-robux-no-joke-2021_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-halloween-costumes-on-roblox_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/roblox-birthday-party-free-printables_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/hack-cojer-cosas-del-catalog-sin-tener-robux_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3547 22524 bytes
SHA-256: 414b7e5ec4d6b3e9b97f1961c2e9e3c8b6b66d704e23223f3fcca5a08ee8dd4d
font_01_sfnt_off0000679f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x679F 2848 bytes
SHA-256: e494dfbc17a31b8b677e20f5e37602c538292163208a26380855969ce973a69b
font_02_sfnt_off00007154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7154 2800 bytes
SHA-256: 1756bf2370268b82899ca819fa059e16c32fca103da24d388e887c3e7a349852
font_03_sfnt_off00007b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4B 18452 bytes
SHA-256: c88fc963111c99bd76411e48cc5f7a93ca1ac40d038cb8251833f774ecd296b3

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