Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7365c5831eafbf…

MALICIOUS

PDF

33.7 KB Created: 2021-06-19 09:04:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b14cea17413b6f3174cbb7d5544894d4 SHA-1: 27e2026e09f18c1897278272438338ac323516fa SHA-256: dc7365c5831eafbf645676182c536210216a9efdbab61eedd10272f1157bcf73
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that explicitly promises 'Earn Free Robux 2021' and similar game-related cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users searching for cheats. The ML classifier strongly flags this PDF as malicious, and the presence of external links points towards a phishing or scam attempt, likely leading to a malicious website or a download. No scripts were extracted, but the overall structure and content strongly suggest a social engineering attack.

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/earn-free-robux-2021-game-hack PDF link annotation
    • http://reggieslockandkey.com/images/www-robux-hack_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-hack-roblox-the-with-downloading-apps_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-items-on-roblox-2021-unpatched_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-roblox-game-card-codes_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-cheat-engine-walthrough_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/if-you-join-this-game-you-get-hacked-roblox_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/hack-roblox-apk-mobil_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6D 21820 bytes
SHA-256: 6c700c87b9bf6d6695bdbb55dce685700e0b1c0418deacf8c0d81529a03c0802
font_01_sfnt_off00005e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7A 19116 bytes
SHA-256: f53d0c0d92abbe590295915ce09fda31863d774b7dc02ceb79bd4622ffcba071

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