Malicious PDF — malware analysis report

Static analysis result for SHA-256 914c1dfb21f6b8d1…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 06:09:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f6ac89f7abd49b04404a9d05f2395785 SHA-1: 02163d62445e6128b04996142e63c1b0ce8c95de SHA-256: 914c1dfb21f6b8d13c6505662e0b058a3b3db1690803271ab05474efaa8424d2
82 Risk Score

Malware Insights

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

The document contains numerous embedded URLs and a prominent call-to-action lure related to obtaining free Robux or game hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of a password-protected archive lure suggests an attempt to bypass security controls. The primary IOC is the external URI pointing to a potential download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/how-to-get-free-robux-easy-down-load-game-hack PDF link annotation
    • http://elibrary.perludem.org/repository/free-supreme-roblox-shirt_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hacking-become-admin-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-someones-account-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-cheat-mad-city-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-muscles-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/paytm-to-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hacks-for-sailing-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-hack-chrome_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-pints-on-earn-robux-gg_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-maniac-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-spins-game-download_GM406889139.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_off0000305e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305E 22540 bytes
SHA-256: 8f0ce83561cf3ec899eb876daea1e5d375c5d10d0d238f36483cf98d530613e7
font_01_sfnt_off00006299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6299 19320 bytes
SHA-256: ea14772b2d79ed6a8ddeeebaf9cc5d24a710714eb33c9d4d612e967812f6a5c9

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