Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c66ff8982b4c5fa…

MALICIOUS

PDF

45.2 KB Created: 2021-06-08 11:12:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b028998ed548f6c371f771291055ee28 SHA-1: 69f9f13eee1c661d7b223f8c23ec68cbc314497e SHA-256: 1c66ff8982b4c5faa2f86707e95acec9023f8e3a63ac0180b0934b7a10bcf76f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure related to 'free Robux' and game hacks, impersonating brands like Netflix to trick users into clicking a malicious link. The embedded URL, https://netcdn.tw/app/431946152/free-robux-games-made-by-roblox-game-hack, is designed to redirect users to potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of external URI links further supports a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/free-robux-games-made-by-roblox-game-hack.
  • 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/free-robux-games-made-by-roblox-game-hack PDF link annotation
    • https://www.wholesomeliving.in/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • https://www.wholesomeliving.in/uploaded_files/userfiles/files/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.wholesomeliving.in/uploaded_files/userfiles/files/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://www.wholesomeliving.in/uploaded_files/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://www.wholesomeliving.in/uploaded_files/userfiles/files/login-robux_GM431946152.pdfIn PDF document text
    • http://www.wholesomeliving.in/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://www.wholesomeliving.in/uploaded_files/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://www.wholesomeliving.in/uploaded_files/userfiles/files/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • https://www.wholesomeliving.in/uploaded_files/userfiles/files/pubg-uc-nepal-price_GM1330123889.pdfIn PDF document text
    • http://www.wholesomeliving.in/uploaded_files/userfiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.wholesomeliving.in/uploaded_files/userfiles/files/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://www.wholesomeliving.in/uploaded_files/userfiles/files/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.wholesomeliving.in/uploaded_files/userfiles/files/no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.wholesomeliving.in/uploaded_files/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wholesomeliving.in/uploaded_files/userfiles/files/easy-points-gg_GM431946152.pdfIn PDF document text
    • https://www.wholesomeliving.in/uploaded_files/userfiles/files/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • https://www.wholesomeliving.in/uploaded_files/userfiles/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.wholesomeliving.in/uploaded_files/userfiles/files/pokemon-go-free-99_GM1094591345.pdfIn PDF document text
    • http://www.wholesomeliving.in/uploaded_files/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.wholesomeliving.in/uploaded_files/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000525a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525A 24760 bytes
SHA-256: d2ecdd7367d332a923347276282b90696c51c7296431afe68027100b9bfb8c53
font_01_sfnt_off00008bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAB 19124 bytes
SHA-256: e71c82195113f4ada92fa18758d4f5dd149db268bd67b01d2a2ff42e0ac111a7

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