Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aec4ad2f01a1952…

MALICIOUS

PDF

34.6 KB Created: 2021-06-28 16:27:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2a9a1402e9c8a3dfae4df468e9444991 SHA-1: 72ec9959acf58c635419beae9a9c99e57efe54aa SHA-256: 4aec4ad2f01a1952a7eed58fd22c1670c3e07c0725e5f819614cb6de058f7983
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains numerous embedded URLs and a document body that explicitly discusses hacking Roblox accounts and obtaining free Robux, acting as a lure. The presence of a password archive lure heuristic suggests the user is expected to download an encrypted file, likely containing a malicious payload. The ML classifier also strongly flagged this PDF as malicious.

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.co/app/431946152/how-to-hack-a-profile-cookie-on-roblox-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-promo-code-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-free-no-offers_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-lumber-tycoon-hack-money_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-roblox-on-a-phone_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/little-kid-caught-cheating-on-his-roblox-girlfriends_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/all-roblox-hacking_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/raindrop-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/people-who-hacked-roblox-and-got-unlmitited-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/master-coins-free_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-meme-tshirts-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/obby-gives-you-free-robux-no-password-required-2021-link_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-studio-are-datasotres-free_GM431946152.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_off000031c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C9 21980 bytes
SHA-256: 386fdd8f1ad5b2842b3db2fece5eebeaab3d100d8dc7ffd93bd1b6b513b5fc84
font_01_sfnt_off00006216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6216 19092 bytes
SHA-256: d0e674c8280c172018edd38c90584e78b58ce78349ec90d0218b76c159ab44c0

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