Malicious PDF — malware analysis report

Static analysis result for SHA-256 5355383d596001ab…

MALICIOUS

PDF

42.6 KB Created: 2021-05-17 14:04:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 26203491008d591d48db0f933483cc46 SHA-1: f4c284c1fc48fd43d85a33730f9863fe3c8f3ed6 SHA-256: 5355383d596001ab8f5b29700a34c55fa612a39721585a29782c7d48bd21d4e7
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 0.9971

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/406889139/daily-coin-master-free-game-hack PDF link annotation
    • https://www.woundcare-today.com/uploads/files/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/robux-cheat_GM431946152.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • https://www.woundcare-today.com/uploads/files/files/roblox-mobile-hack_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cc4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC4 24468 bytes
SHA-256: e80ee8529557f5ffb3bb75848950b9eb9336862d57b2289bb7b6f51b2623bad2
font_01_sfnt_off000084e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E2 18132 bytes
SHA-256: f675a037fef76fd82d09f8680fbeb6a72eeb7684feda5ffd824d9b16b19a33e7

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