Malicious PDF — malware analysis report

Static analysis result for SHA-256 beca551b61a9d363…

MALICIOUS

PDF

46.4 KB Created: 2021-06-09 12:21:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 09016aab90f59340eb96b726904bc5ee SHA-1: e2f05118e4f36802f1b931f71ad0848238d70eb8 SHA-256: beca551b61a9d363e4bbc064dff39724b3205d679e9196719d4492cc53ed0d3f
102 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which point to other PDF files hosted on similar domains, suggesting a link farm designed to distribute malicious content. The document body and embedded links promote a "Free Robux Generator" lure, indicating a phishing or scam attempt. The presence of a ML classifier hit and the PDF_SEO_LINK_FARM heuristic strongly suggest malicious intent, likely to redirect users to exploit kits or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/free-robux-generator-survey-game-hack
    • http://immo360grad.com/images/robux-redeem-card-hack_GM431946152.pdf
    • http://immo360grad.com/images/como-hackear-coin-master-ios_GM406889139.pdf
    • http://immo360grad.com/images/promo-codes-for-free-robux_GM431946152.pdf
    • http://immo360grad.com/images/free-robux-no-downloading-apps_GM431946152.pdf
    • http://immo360grad.com/images/is-minecraft-java-edition-free_GM479516143.pdf
    • http://immo360grad.com/images/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://immo360grad.com/images/minecraft-free-minecoins_GM479516143.pdf
    • http://immo360grad.com/images/fb-coin-master_GM406889139.pdf
    • http://immo360grad.com/images/funny-roblox-outfits-and-free-outfits_GM431946152.pdf
    • http://immo360grad.com/images/how-to-make-a-group-on-roblox-for-free_GM431946152.pdf
    • http://immo360grad.com/images/coin-master-rewards-app_GM406889139.pdf
    • http://immo360grad.com/images/how-to-win-robux_GM431946152.pdf
    • http://immo360grad.com/images/www-claim-gg-to-earn-free-robux_GM431946152.pdf
    • http://immo360grad.com/images/hacks-to-get-free-robux_GM431946152.pdf
    • http://immo360grad.com/images/tiktok-free-view-300_GM835599320.pdf
    • http://immo360grad.com/images/free-spins-coin-master-october-17-2021_GM406889139.pdf
    • http://immo360grad.com/images/free-robux-no-verify-2021_GM431946152.pdf
    • http://immo360grad.com/images/free-spins-coin-master-links_GM406889139.pdf
    • http://immo360grad.com/images/coin-master-cheats-for-free-spins_GM406889139.pdf
    • http://immo360grad.com/images/minecraft-windows-10-edition-hacked-client_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000505a.bin
80b6f71992b568287e20af647ad15bc112fff430d1c56900e6f0a5e064070db7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x505A 29316 bytes
font_01_sfnt_off000091a4.bin
a167f1447a2a0c07ee889efa7cbb7a128ab039d5fd645e59dec55fc6a623599e
pdf-font-stream PDF embedded font (sfnt) at offset 0x91A4 18640 bytes