Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff90c52c55c6054…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 17:21:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: beaf580de000ecb762192ad5e273aac8 SHA-1: aa572e7008c2b86b73f43ba0f462f731dd6c9ff1 SHA-256: 6ff90c52c55c60549730d8a57803e52e74222091c1ff24eb7480003b46b2c831
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering free Robux and game hacks, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" lure reinforces the malicious intent. The document's structure suggests it's part of a link farm designed to drive traffic to potentially malicious sites.

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/robux-com-free-robux-game-hack
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/free-robux-promo-codes-july-2021_GM431946152.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/como-hackear-coin-master-ios_GM406889139.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/coin-master-links-for-today_GM406889139.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/robux-free-generator-no-human-verification_GM431946152.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/free-roblox-money_GM431946152.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/is-hacking-roblox-a-crome_GM431946152.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/cheat-engine-63-roblox-hacks_GM431946152.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/free-coins-spins-on-coin-master_GM406889139.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/coinmaster-rewards_GM406889139.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/hack-coin-master-no-human-verification_GM406889139.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/free-robux-scams_GM431946152.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/coin-master-hack-app_GM406889139.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/free-spins-coin-master-blogspot_GM406889139.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/minecraft-pe-hacked-client-download_GM479516143.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/tiktok-free-view-pro-app-download_GM835599320.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdf
    • http://mtsnslemankota-elearning.net/__statics/gudangsoal/files/hack-to-send-gold-cards-on-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ee4.bin
e5c1e4f4928069595a08d1d08e01351cdf7c39a996f2021e9e2a9ac93c1f7830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE4 22168 bytes
font_01_sfnt_off0000601d.bin
27896acad5ca474033774e3721745fbaf6546dbb33b60a4a93bb974a81ff43ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601D 18976 bytes

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