Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cdb3f5fbafbc56…

MALICIOUS

PDF

33.3 KB Created: 2021-07-04 20:03:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dde70c74cfd03c006de7771ceb2c525f SHA-1: 96745ab8188b94ebf93aa3c72d5ad9b9ffc82694 SHA-256: a3cdb3f5fbafbc566af6acd2a65f222da5ba135c00ccb569ad3f98f2ac6233f2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are related to game hacks and cheats for popular games like Minecraft and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a deliberate attempt to attract users seeking illicit software. The ML classifier also flagged this PDF as malicious with high confidence.

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/479516143/minecraft-free-install-game-hack PDF link annotation
    • http://www.myresidence.lu/userfiles/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-free-robux-generator-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/robux-hack_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/get-free-lp-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/pubg-uc-website-india_GM1330123889.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/pokemon-go-hack-version-free-download_GM1094591345.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/get-robux-today_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB8 22584 bytes
SHA-256: 95fce7a98be5ec50e2b41f689f6e14eeaeff63387c30eedeac12c65023be29a5
font_01_sfnt_off000060bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BB 17928 bytes
SHA-256: ecac4b827e849319c0c5044e9321c91e8ddddd01a8be4fd48df7e18ba0227d57

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