Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db10834f9db0133…

MALICIOUS

PDF

48.6 KB Created: 2021-05-17 06:34:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 744f2adaa5b96c57f58c7118c0d3e935 SHA-1: 9cfba4929e93222a6ee387f39d6119ce24a95f0c SHA-256: 2db10834f9db0133dda1612d6a8cc97bdbc6a439cef4d15ef86b882de88bd84e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF gateways. The document body and extracted URLs suggest a lure for free game currency (Robux, Coin Master spins) which is a common tactic for phishing or distributing malware. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 5

  • 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.
  • 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 https://netcdn.xyz/app/431946152/how-to-get-free-roblox-money-game-hack
    • http://1a-vermietung.com/images/free-roblox-accounts-with-robux_GM431946152.pdf
    • http://1a-vermietung.com/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdf
    • http://1a-vermietung.com/images/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://1a-vermietung.com/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://1a-vermietung.com/images/free-roblox_GM431946152.pdf
    • http://1a-vermietung.com/images/coin-master-hack-pc-cheat-engine_GM406889139.pdf
    • http://1a-vermietung.com/images/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdf
    • http://1a-vermietung.com/images/freerobuxhack-us_GM431946152.pdf
    • http://1a-vermietung.com/images/download-hacked-games-coin-master_GM406889139.pdf
    • http://1a-vermietung.com/images/roblox-hack-codes_GM431946152.pdf
    • http://1a-vermietung.com/images/free-robux-on-iphone_GM431946152.pdf
    • http://1a-vermietung.com/images/roblox-hack-app_GM431946152.pdf
    • http://1a-vermietung.com/images/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • http://1a-vermietung.com/images/roblox-how-to-get-free-clothes_GM431946152.pdf
    • http://1a-vermietung.com/images/coin-master-hack-ios-download_GM406889139.pdf
    • http://1a-vermietung.com/images/robux-no-human-verification_GM431946152.pdf
    • http://1a-vermietung.com/images/wurst-client-18-9_GM479516143.pdf
    • http://1a-vermietung.com/images/coin-master-hack-ios-apk_GM406889139.pdf
    • http://1a-vermietung.com/images/free-coin-master-spin-generator_GM406889139.pdf
    • http://1a-vermietung.com/images/300-free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049e1.bin
506a535928af648293cf3e1149eef727cce9e074f526021dd9d88d25a3f8b5b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49E1 29112 bytes
font_01_sfnt_off00008d94.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D94 5696 bytes
font_02_sfnt_off00009aa6.bin
b73f1f0d33754a6311a400e0f9b7fa1bed8423beec91854f27c9eb8add8b4fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA6 18592 bytes

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