Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec798fe71a62ccb8…

MALICIOUS

PDF

34.5 KB Created: 2021-06-26 00:37:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 025a953d1dd6abe8da266b3d891d8472 SHA-1: 9e11e30d194300e983567600d9253cecf29351ea SHA-256: ec798fe71a62ccb82ecdc1a47de63bc2727302d91515f910fb6fc2b2e151f808
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which are SEO-optimized and point to game-related cheats and currency. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. The primary attack pattern observed is the use of a link farm within a PDF to deceive users into clicking on malicious URLs.

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.co/app/431946152/blockland-for-free-robux-game-hack
    • https://elibrary.ikhac.ac.id/repository/how-to-get-free-robux-without-using-apps_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/roblox-hack-phantom-forces-cheat_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/download-phantom-forces-roblox-aimbot-hack-script-2021_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/coin-master-hack-100-working_GM406889139.pdf
    • https://elibrary.ikhac.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/coin-master-spins-for-free_GM406889139.pdf
    • https://elibrary.ikhac.ac.id/repository/free-robux-by-doing-surveys_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-robux-gift_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/roblox-patched-cheat-engine_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/coin-master-fan-page-giveaway_GM406889139.pdf
    • https://elibrary.ikhac.ac.id/repository/pastebin-free-robux-2021_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/free-robux-codes-2021-not-used-no-human-verification_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/coin-master-70-spin-link_GM406889139.pdf
    • https://elibrary.ikhac.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdf
    • https://elibrary.ikhac.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/robux-gratis-2021-hack_GM431946152.pdf
    • https://elibrary.ikhac.ac.id/repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdf
    • https://elibrary.ikhac.ac.id/repository/coin-master-game-hack-version-download_GM406889139.pdf
    • https://elibrary.ikhac.ac.id/repository/how-do-you-get-robux-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003059.bin
dcc82c42a9f0f1a5a0a6a113986ac4b49764c744e0e23b9a74e33896d97ed1b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x3059 22344 bytes
font_01_sfnt_off000061a2.bin
2bedcf0f85ed6e4d81c77ae767a5ed6c80c1c1bf7a9e3db7a7768461991733e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x61A2 19132 bytes