Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f5b0f6a370346b…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 11:50:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 81d19b2a346a0a38d08e606e2c29fa23 SHA-1: 35ae2d21b388293a4a0befc3e5e365b24bfd4385 SHA-256: 37f5b0f6a370346b39577f81386ed88146dcc1f1ff0c1e717107ac25127c156e
62 Risk Score

Malware Insights

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

The document contains multiple embedded URLs and a prominent external URI pointing to a download site, all related to obtaining free Robux. The ML classifier strongly flagged this PDF as malicious, and the presence of download lures and callback phishing elements suggests a social engineering attempt to trick the user into downloading a malicious payload. No scripts were extracted, but the overall pattern indicates a downloader or trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/robux-no-survey-game-hack
    • https://opac.umrah.ac.id/repository/free-robux-without-human-verification_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/howto-get-free-robux-hack-javascript_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • https://opac.umrah.ac.id/repository/youtube-roblox-dax-she-cheated-roblox-code_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/how-to-get-roebucks-in-roblox_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/free-robux-without-having-to-download-a-game_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/free-roblox-outfits-boys_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/download-hack-roblox-pc_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/free-robux-mod_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/how-to-hack-someones-roblox-account-on-phone_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/free-robux-codes-2021-june_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/roblox-exploit-synapse-x-free_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/www-free-robux-org_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/roblox-script-give-gamepass-for-free_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/easy-robux-today-com_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/free-robux-for-roblox-2021_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/free-tix-roblox-hack_GM431946152.pdf
    • https://opac.umrah.ac.id/repository/tiktok-free-fans_GM835599320.pdf
    • https://opac.umrah.ac.id/repository/free-robux-de-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e25.bin
ec06370b5fe1fbfd742a4e6e7cda451495368602a64ab375a541f1bd9ec02f15
pdf-font-stream PDF embedded font (sfnt) at offset 0x2E25 22340 bytes
font_01_sfnt_off00006002.bin
c70c18245f3514fbd0595f07482cf26ba9ec715c6560f691cfe3a4c485707883
pdf-font-stream PDF embedded font (sfnt) at offset 0x6002 18844 bytes