Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b712b77d365b1c…

MALICIOUS

PDF

49.2 KB Created: 2021-06-07 13:48:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 039aa48bd873b0af97812fd80fb3806f SHA-1: afed39a1ed392d9826723c9d83460791c96fd40c SHA-256: e8b712b77d365b1cdecbd9029e96e9daa4c64236a8cc34c17c762dc0258f818e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a lure related to free game items and hacks, impersonating Microsoft to trick users into clicking a malicious link. The link, https://netcdn.tw/app/431946152/free-roblox-girl-shirts-game-hack, likely leads to a credential phishing page or further malware. The presence of a 'clipboard command execution lure' suggests an attempt to trick the user into executing commands, potentially to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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-roblox-girl-shirts-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-roblox-girl-shirts-game-hack PDF link annotation
    • http://www.digilib.uim.ac.id/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-lego-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-juwelen-hack-mad-paintball2_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_off000050a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A6 27196 bytes
SHA-256: 4b538de48a72ce02c531fbfc2398caa266f311bca248c57fe056a5d86ca0dcbf
font_01_sfnt_off000090af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90AF 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC0 18340 bytes
SHA-256: 351f8231323465b11cb227ebeab49d075b75a616bd8095e43cf23e76bc68f746

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