Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83ad715798725e7…

MALICIOUS

PDF

35.3 KB Created: 2021-07-07 23:56:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3981ddb98ac71ab5a2f6c894e6ff7de1 SHA-1: d3f047b363aabef250d9af8573692d5f62216e15 SHA-256: d83ad715798725e72298298671ed1a336fe33dd42bca7fb02585eb76470db4dc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that promotes 'free Robux' and game hacks, indicating a phishing or scam attempt. The heuristic PDF_SEO_LINK_FARM and PDF_URI firings, along with the ML_NYX_PDF_MALICIOUS score, strongly suggest malicious intent. The document likely serves as a lure to direct users to malicious websites hosted on netcdn.tw and other domains, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-robux-co-game-hack
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/roblox-hack-org_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/blox-land-free-robux_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/how-to-hack-critical-strike-roblox_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/how-to-have-robux-for-free-2021_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-videos_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/coin-master-free-coins-links-2021_GM406889139.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/roblox-cbr-free-weekend-glitch_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/roblox-hack-init-roblox-hack-addrobux_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-pc_GM406889139.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/free-robux-generator-2021-robux-hack-no-survey_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/free-roblox-scripts_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/all-roblox-games-for-free_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-email_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/free-robux-scam_GM431946152.pdf
    • https://elearning.mtsn8jombang.sch.id/__statics/gudangsoal/files/robux-cheat_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031f0.bin
e333c314e3ab58e78b0f6b56fdc991713dbc94f09d9f6db8078796db9796a2c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31F0 22980 bytes
font_01_sfnt_off000065db.bin
ae86725dd70d168e8b5a24377d7effb3bd88f81667aa3e091abc0f5759eb354b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DB 18716 bytes

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