Malicious PDF — malware analysis report

Static analysis result for SHA-256 de90598d855e994d…

MALICIOUS

PDF

36.4 KB Created: 2021-07-09 19:24:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8e7ef42a4c0dc598ea5d02e9554cd4a4 SHA-1: 3bb1da02d8a1e4cbe108f526adfff2236baa6fb3 SHA-256: de90598d855e994d315d201bb80bf35e04a04fdaba4e71801124b81ce6481ace
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document presents a lure for free Robux, indicated by the document body and multiple embedded URLs pointing to related content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests a potential download or redirection to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing or scam attempt designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/431946152/how-to-get-free-robux-without-downloading-apps-2021-game-hack PDF link annotation
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/cheats-for-gta-5-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/free-hacked-accounts-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/how-do-i-get-free-robux-on-a-phone_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/free-robux-vido_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/free-roblox-mod-menus_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/gaming-app-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/https-www-roblox-com-free-account_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/what-roblox-hack-works_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/how-to-use-cheat-engine-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/free-admin-roblox-games_GM431946152.pdfIn PDF document text
    • https://www.e-learning-min1berau.com/__statics/gudangsoal/files/www-coin-master-hack-com_GM406889139.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
font_00_sfnt_off0000316f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316F 23036 bytes
SHA-256: ab59c787d8f432c6353331a80b7ebca12de1c4da479bc3f2a1e6597f55c8f107
font_01_sfnt_off0000651d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651D 20464 bytes
SHA-256: bbee3cd2d045934f3587faaae269c5438879465e49c598d076b35cc198d7b491

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