Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c56f277aee4172…

MALICIOUS

PDF

48.6 KB Created: 2021-06-08 19:06:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 20695008d8b42a984f94b7fe68ee3e45 SHA-1: 95bd5e423093169908290c68899fcaf7e23f2728 SHA-256: 81c56f277aee4172bd4a6eea6a089d2ab00fefdd502240859bce519e8ac78e66
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a prominent URL in its body, all related to 'free Robux' and game hacks. This strongly suggests a social engineering lure to direct users to potentially malicious websites. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-robux-hack.for-any-decice-game-hack
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/you-promised-my-son-free-robux_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/roblox-fun-com-free-robux_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-spin-link-for-coin-master-game_GM406889139.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-without-verification-2021_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-accounts_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-printable-minecraft-coloring-pages_GM479516143.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-spin-link-for-coin-master_GM406889139.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/how-to-get-free-shirts-on-roblox-2021_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-no-offers_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/tiktok-viewer-free_GM835599320.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-coins-on-coin-master_GM406889139.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/coin-master-free-link_GM406889139.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-avatar-roblox_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-hacks-no-verification_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-easy_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/admin-command-roblox-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000524e.bin
19595bf4bcb220638e61e99514e28751b9f0b9a5d88cfb1b4882e50a704ccc1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x524E 25116 bytes
font_01_sfnt_off00008c83.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C83 3884 bytes
font_02_sfnt_off0000992b.bin
fe59c786fdab038a9b7a5a5f8dc76b26f06fe7f26c8e851aaaad90fdbe585b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x992B 18944 bytes

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