Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad90b93fb7074250…

MALICIOUS

PDF

47.0 KB Created: 2021-05-14 01:35:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 69b66ddfb24f7dd73f9e61fab7b347ee SHA-1: 924b31dcecdeda474982cbe005214e4915b6584c SHA-256: ad90b93fb7074250b36edcef4346b38d935d3ba2531a4ea5a7543f05f280d032
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.8948

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/robux-hack-tools-game-hack PDF link annotation
    • https://smszepce.info/images/cone-master_GM406889139.pdfIn PDF document text
    • https://smszepce.info/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://smszepce.info/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://smszepce.info/images/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://smszepce.info/images/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://smszepce.info/images/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • https://smszepce.info/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://smszepce.info/images/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • https://smszepce.info/images/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • https://smszepce.info/images/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://smszepce.info/images/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://smszepce.info/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://smszepce.info/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://smszepce.info/images/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://smszepce.info/images/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://smszepce.info/images/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • https://smszepce.info/images/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://smszepce.info/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • https://smszepce.info/images/blox-fun-info_GM431946152.pdfIn PDF document text
    • https://smszepce.info/images/minecraft-116-free-download_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
font_00_sfnt_off00004a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A62 28944 bytes
SHA-256: 40fa549f270a52fe28a6461607411f1cdabaa24f6869f0ec3ef2f83392ceb7e3
font_01_sfnt_off00008a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A70 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off00009516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9516 18320 bytes
SHA-256: cf6d0fcc2a7c18e0ae1e84145e037068603b130caaef77e993c358e364abbe1e

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