Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a0e763356ab9df…

MALICIOUS

PDF

43.7 KB Created: 2021-05-15 06:31:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f10b132d56ff0438eb5942bf828321aa SHA-1: 2fd9b97c0883ffa17749af8cc64eb1d0806d2847 SHA-256: b1a0e763356ab9df1bda764473e916387705e26a238124895ce7ed539b1d1552
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to potentially malicious websites. The presence of a download button lure and a high ML classifier score further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/431946152/rbxoffers-com-free-robux-game-hack
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-spins-coin-master-october-13-2021_GM406889139.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/blox-world-free-robux_GM431946152.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-instantly_GM431946152.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/coin-master-free-spins-bit-ly_GM406889139.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-spins-coin-master-links-2021_GM406889139.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/code-free-robux_GM431946152.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/robux-hack-free-robux_GM431946152.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-roblox-card_GM431946152.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/2021-free-spins-coin-master_GM406889139.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-roblox-executor_GM431946152.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-robux-codes-2021-real_GM431946152.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/minecraft-redeem-code-free_GM479516143.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/minecraft-free-download-no-virus_GM479516143.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/coin-master-spin-link-today-2021_GM406889139.pdf
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/roblox-source_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d09.bin
704154f82b7ecf6c4cad5bfed8253f00aeed3f58bcc8ed909966daa109bdb2f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D09 25688 bytes
font_01_sfnt_off000088ad.bin
33587a0de9fe244dccc6feb4df3ae622cc669a227e305313b85abf77a5936fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88AD 18276 bytes

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