Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d639838f2353b1…

MALICIOUS

PDF

35.6 KB Created: 2021-07-03 11:51:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d1fbc6afa7b779cf7f4d402a3b11f769 SHA-1: a7ebe877a3e2389dd39c979416acc95acf98fa70 SHA-256: f2d639838f2353b1b4cd82ab44e2254a07bc15db1667fc637ace80da395b3353
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are related to game cheats and free in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a tactic to drive traffic to potentially malicious or scam-related sites. The ML classifier also flagged this PDF as malicious with high confidence.

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/406889139/coin-master-free-spins-link-march-2021-game-hack
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/roblox-free-robux-obby-working-100_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/how-you-get-free-robux_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/coin-master-rewards-app_GM406889139.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-daily_GM406889139.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/coin-master-free-spin-trick_GM406889139.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/free-robux-come_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/free-roblox-robbux_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/radio-cheat-roblox-script_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/earn-robux_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/tower-of-hell-roblox-hack_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/robloxfun-com-robux_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/how-to-report-being-hack-on-roblox_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/free-account-in-roblox-login-password_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/free-robux-offers_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/all-coin-master-spin-link-and-free-download_GM406889139.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/what-is-the-best-free-for-all-roblox-game_GM431946152.pdf
    • https://elearning.mtsn4kotajambi.sch.id/__statics/gudangsoal/files/hack-coin-master-download-ios_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032f8.bin
3f230d19590b49023987fc0e1935db7dafc90765ae12967bdfaedf9f3a2ba345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32F8 23052 bytes
font_01_sfnt_off000066c5.bin
bdaeed2a2d35cd5403fa884150965b7cf2968e80c04f285ab32196e93ef33165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C5 18912 bytes

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