Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b87fb3a8717e90…

MALICIOUS

PDF

50.9 KB Created: 2021-06-10 13:53:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 21c7ce22f791a21aa9622a9fa76f9c76 SHA-1: 1b70105ee2db004c24d32472cb64f92554706ca7 SHA-256: 21b87fb3a8717e909e2fa529e60798c2e265c17e4033177ca7d4888e6efb44b8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are part of a link farm, suggesting a tactic to increase search engine visibility for potentially malicious content. The document body explicitly mentions 'Free Robux Card' and includes a URL that appears to be a lure for game-related cheats or hacks. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading or visiting a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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-card-no-humaon-verification-2021-game-hack
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/worst-client_GM479516143.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/coin-master-free-blogspot_GM406889139.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/coin-master-sound-daily-free-spins-link-today_GM406889139.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-phone_GM431946152.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/omplete-surveys-for-coin-master-free-spins_GM406889139.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/coin-master-free-spins-generator-no-verification_GM406889139.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/how-do-you-earn-robux-on-roblox_GM431946152.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/coin-master-ios-hack-download_GM406889139.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-generator_GM431946152.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/2021-free-spins-coin-master_GM406889139.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/20-free-spin-link-coin-master_GM406889139.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/free-coin-master-spin-generator_GM406889139.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-download_GM406889139.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/roblox-april-fools-hack_GM431946152.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/blogspot-coin-master-free-spins_GM406889139.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/free-robux-safe_GM431946152.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/xray-hack_GM479516143.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/free-roblox-card-codes-june-2021_GM431946152.pdf
    • https://elearning.man1padangpariaman.sch.id/__statics/gudangsoal/files/coin-master-free-spins-bit-ly_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054d6.bin
5a613ac3e9107e7ddd34d5f5497e5b6bd69becb2bdcf32c3c7ef979ee2e2cfcf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54D6 28588 bytes
font_01_sfnt_off00009705.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9705 2824 bytes
font_02_sfnt_off0000a0b3.bin
e1d5deff888d40555e361ca09a026af84f62a3d9911b76e6b33f9940eb46c803		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B3 19436 bytes

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