Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b7ce641741d60b…

MALICIOUS

PDF

35.7 KB Created: 2021-07-03 18:32:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 34c470c74fca5e0970c50d15055f9e65 SHA-1: c8f2f4e8c260ce3ff6546cf09ef7f8ad61d923bf SHA-256: 73b7ce641741d60b2aef3679be33d791d29006bb5f3fbc54f9a01fc64b065023
122 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a document body that lures users with promises of free game items and hacks for popular games like Roblox and Coin Master. The heuristic findings indicate a link farm and a callback lure, suggesting the primary goal is to direct users to malicious websites for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-change-your-username-on-roblox-for-free-2021-game-hack
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-diamonds-in-roblox-royale-high_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/boku-no-roblox-hack-quirk_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/roblox-the-plaza-plane-free_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-a-free-dominus-hat-on-roblox-2021_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/hack-to-get-free-robux-2021_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/hack-roblox-phantom-forces-synapse_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/coin-master-daily-free-spins-link_GM406889139.pdf
    • https://lib.bunghatta.ac.id/app/repository/roblox-uno-scirpt-hack_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/roblox-hacker-stories_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/dll-hack-for-roblox-assasin_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/free-pro-roblox-island-royale-acc-and-passwords_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/shadow-raid-loot-cheats-roblox-notoriety_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/2021-free-robux-glitch-in-febuary_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/hack-coin-master-spin_GM406889139.pdf
    • https://lib.bunghatta.ac.id/app/repository/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdf
    • https://lib.bunghatta.ac.id/app/repository/how-to-hack-free-robux-on-pc_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/pointsprizes-free-robux_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/hack-pacifico-2-roblox_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/minecraft-free-apk_GM479516143.pdf
    • https://lib.bunghatta.ac.id/app/repository/coin-master-cards-free-cards_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030f7.bin
1c3577b0144d7a4500ddd5f0b8ae7302c80b8d67e6549e4b587e12f1a3e7d2a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30F7 22716 bytes
font_01_sfnt_off00006420.bin
941d7874c20e01d2e3c218a6689e46eb54611adc3eaa4e174989dc6aeaced13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6420 19944 bytes

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