Malicious PDF — malware analysis report

Static analysis result for SHA-256 a210d6951af8e00e…

MALICIOUS

PDF

47.4 KB Created: 2021-06-10 23:56:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 785c038920ea809d78a06ce6582cb448 SHA-1: 7b11fb80fcc999dac8212d067c7d5e379608f653 SHA-256: a210d6951af8e00ea9fe9e517d14d95bc55587e962f9c50cb27fe23083f9d4a3
182 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are part of a link farm designed to mimic search results for popular games and cheats. The heuristic 'SE_FAKE_CAPTCHA' indicates the document likely presents a fake verification prompt to trick users into clicking these links. The presence of 'PDF_SEO_LINK_FARM' and the ML classifier's high confidence score further support a malicious intent, likely to redirect users to sites hosting malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/code-2021-robux-free-daily-game-hack
    • http://www.alpaca-buitensport.nl/images/bloxfree-free-robux_GM431946152.pdf
    • http://www.alpaca-buitensport.nl/images/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://www.alpaca-buitensport.nl/images/free-roblox-clothes_GM431946152.pdf
    • http://www.alpaca-buitensport.nl/images/minecraft-java-edition-free-code_GM479516143.pdf
    • http://www.alpaca-buitensport.nl/images/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://www.alpaca-buitensport.nl/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdf
    • http://www.alpaca-buitensport.nl/images/roblox-bee-swarm-simulator-hack-games_GM431946152.pdf
    • http://www.alpaca-buitensport.nl/images/roblox-royale-high-diamond-hack_GM431946152.pdf
    • http://www.alpaca-buitensport.nl/images/minecraft-realms-free-codes_GM479516143.pdf
    • http://www.alpaca-buitensport.nl/images/how-to-get-robux-for-free-for-kids_GM431946152.pdf
    • http://www.alpaca-buitensport.nl/images/pokemon-go-free-7km-eggs-june-2021_GM1094591345.pdf
    • http://www.alpaca-buitensport.nl/images/roblox-hacks-safe_GM431946152.pdf
    • http://www.alpaca-buitensport.nl/images/free-robux-without-doing-anything_GM431946152.pdf
    • http://www.alpaca-buitensport.nl/images/can-i-play-minecraft-for-free_GM479516143.pdf
    • http://www.alpaca-buitensport.nl/images/roblox-hack-client_GM431946152.pdf
    • http://www.alpaca-buitensport.nl/images/can-i-download-minecraft-for-free_GM479516143.pdf
    • http://www.alpaca-buitensport.nl/images/how-to-get-pants-not-by-roblox-free_GM431946152.pdf
    • http://www.alpaca-buitensport.nl/images/minecraft-build-hacks_GM479516143.pdf
    • http://www.alpaca-buitensport.nl/images/coin-master-15-free-spin-link-today_GM406889139.pdf
    • http://www.alpaca-buitensport.nl/images/roblox-got-talent-piano-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005242.bin
0b4692a244ea09de96a2792001883fba7ab0e536457e48278a5112f335488585		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5242 29548 bytes
font_01_sfnt_off0000937c.bin
c893792ac5f5b16d6ba0fc5e47e5bb25937b97872e52c39741ed5a7d7cf21aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x937C 19360 bytes

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