Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6463d684fa991eb…

MALICIOUS

PDF

41.4 KB Created: 2021-05-12 00:01:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fa1755ade545e191c092c92f4f728ad1 SHA-1: 6a7c26fb5bb329179b98cd52a511ae8345fc9203 SHA-256: f6463d684fa991ebef2c2253569120795ab9eb74390514d20e4ebd444de2ee2a
162 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a fake CAPTCHA lure, strongly suggesting a phishing or scam attempt. The document body and extracted URLs promote 'free Robux' and 'Coin Master spins', indicating a lure for game-related scams. The presence of a large number of external links classified as a 'link farm' further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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
  • 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 https://netcdn.xyz/app/431946152/free-robux-accounts-2021-game-hack
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/free-spin-sites-for-coin-master_GM406889139.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/robux-survey_GM431946152.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/www-rubux_GM431946152.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/coin-master-free-coins-cheat_GM406889139.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/how-to-get-free-robux-codes_GM431946152.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/how-to-make-a-minecraft-client_GM479516143.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/2021-free-spins-on-coin-master_GM406889139.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/more-robux_GM431946152.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/coin-master-hack-mod-game-download_GM406889139.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/robux-no-human-verification_GM431946152.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/free-robux-on-iphone_GM431946152.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/roblox-free-robux-hack_GM431946152.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/free-coin-master-spins-hack_GM406889139.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/how-to-get-free-robux-generator_GM431946152.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/roblox-hack-me-robux_GM431946152.pdf
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/free-robux-apk_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046da.bin
a6a4ef60f6594604d3f33e1dc2014d1fea9310fae97e669d41e6cb195f593a32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46DA 24372 bytes
font_01_sfnt_off00007e51.bin
56624e41a965b33e02442574776651ebbc56d14fd3e4bfe95c3ae0db26e97c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E51 18520 bytes

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