Malicious PDF — malware analysis report

Static analysis result for SHA-256 88491ec33e6d7a89…

MALICIOUS

PDF

47.1 KB Created: 2021-05-11 21:08:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a7bf181730db49048a9792e019014d96 SHA-1: bcc438ce8bf7a64cd54780c5f4fefc98a7dbc798 SHA-256: 88491ec33e6d7a8939aea82f3b7da0b46982fc1bbdb9e9bcea381fa21a96194a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that attempts to lure users with promises of free Robux. The PDF_SEO_LINK_FARM heuristic indicates a mass of external links, likely for SEO manipulation, pointing to other PDF files hosted on similar domains. The ML_NYX_PDF_MALICIOUS score of 0.997706 strongly suggests malicious intent. The primary attack pattern involves using a seemingly legitimate document to drive traffic to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/how-to-get-free-robux-without-downloading-anything-game-hack
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/microsoft-bing-robux_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-apk-download_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-coins-on-coin-master_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/what-do-roblox-points-do_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-spins-coin-master-android_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/robloxfun-com-generator_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification-2021_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-robux-real_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-time-hack_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-roblox-clothes-codes_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-spin-hack-no-human-verification_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/get-free-robux-generator_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/easy-how-to-get-free-robux_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/omplete-surveys-for-coin-master-free-spins_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/300-daily-free-spins-coin-master_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-robux-codes-no-verification_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/roblox-script-hack_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/rbxoffer-com-free-robux_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005131.bin
66abc9aeecf5e4d82c79c945347b64f6e83a2ce428a366951b2c779673ea2b67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5131 28692 bytes
font_01_sfnt_off00009172.bin
b3cc443709e3d0792834aff36fc45ebf0729ec5a88bbf4f00dbe60b4c0075203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9172 19880 bytes

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