Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dcece7c359d503…

MALICIOUS

PDF

43.5 KB Created: 2021-05-14 06:18:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 39f05d16b1d360093db5e73b5353c1b3 SHA-1: f8171f67c749db2d434ecfe22742aa0fd816b0cf SHA-256: f4dcece7c359d503bf5189c71a0a73d872fc823a0371e0384d95a1e2d9b67785
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body referencing 'free Robux' and 'Coin Master hack' lures. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/how-to-get-free-robux-generator-game-hack
    • http://stroybelan.ru/images/coin-master-hack-spins-game-download_GM406889139.pdf
    • http://stroybelan.ru/images/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://stroybelan.ru/images/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://stroybelan.ru/images/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdf
    • http://stroybelan.ru/images/free-robux-com-roblox_GM431946152.pdf
    • http://stroybelan.ru/images/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdf
    • http://stroybelan.ru/images/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • http://stroybelan.ru/images/get-free-cards-in-coin-master_GM406889139.pdf
    • http://stroybelan.ru/images/roblox-t-shirt-free_GM431946152.pdf
    • http://stroybelan.ru/images/roblox-hack-game_GM431946152.pdf
    • http://stroybelan.ru/images/coin-master-free-in-app-purchases_GM406889139.pdf
    • http://stroybelan.ru/images/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdf
    • http://stroybelan.ru/images/minecraft-realms-free-trial_GM479516143.pdf
    • http://stroybelan.ru/images/free-minecraft-server-hosting_GM479516143.pdf
    • http://stroybelan.ru/images/links-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://stroybelan.ru/images/download-minecraft-java-edition-free_GM479516143.pdf
    • http://stroybelan.ru/images/free-downloads-for-coin-master-daily-rewards_GM406889139.pdf
    • http://stroybelan.ru/images/how-many-villages-are-in-coin-master_GM406889139.pdf
    • http://stroybelan.ru/images/free-links-for-coin-master_GM406889139.pdf
    • http://stroybelan.ru/images/free-robux-no-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049eb.bin
e38d67ab2134353a17dbe2ac958ffdc0d33ee894f4d995231cdd5367cf5b1669
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49EB 27248 bytes
font_01_sfnt_off000086f1.bin
02a745270f20da848e9c9bdefc0721d63769b74524dfc6c51231bae9bb0d5f7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x86F1 18512 bytes