Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5df2b9bfeee736…

MALICIOUS

PDF

43.0 KB Created: 2021-05-17 00:00:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 48d9f9f485033b3bf84de48ae43d7075 SHA-1: bb005b62e880a8c5c7e50b0a2592dcc695c80ada SHA-256: 5d5df2b9bfeee736b910da613204de62f39d869bbd0909eaca1399c8596e2c05
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious content. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests a download or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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
  • 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/roblox-free-items-game-hack
    • https://www.linzgau-kjh.de/images/how-to-play-minecraft-with-friends-for-free_GM479516143.pdf
    • https://www.linzgau-kjh.de/images/coin-master-on-facebook_GM406889139.pdf
    • https://www.linzgau-kjh.de/images/coin-master-free-spins-and-coins-generator_GM406889139.pdf
    • https://www.linzgau-kjh.de/images/get-free-cards-coin-master_GM406889139.pdf
    • https://www.linzgau-kjh.de/images/coin-master-hacks-that-work_GM406889139.pdf
    • https://www.linzgau-kjh.de/images/official-coin-master-free-spins_GM406889139.pdf
    • https://www.linzgau-kjh.de/images/coin-master-free-spin-daily-link_GM406889139.pdf
    • https://www.linzgau-kjh.de/images/coin-master-hack-mod-apk-2021_GM406889139.pdf
    • https://www.linzgau-kjh.de/images/roblox-hacked-com-2021_GM431946152.pdf
    • https://www.linzgau-kjh.de/images/best-way-to-get-free-robux_GM431946152.pdf
    • https://www.linzgau-kjh.de/images/master-coin-hack_GM406889139.pdf
    • https://www.linzgau-kjh.de/images/free-robux-hacker-us_GM431946152.pdf
    • https://www.linzgau-kjh.de/images/robux-generator-no-verification-needed_GM431946152.pdf
    • https://www.linzgau-kjh.de/images/minecraft-java-account-free_GM479516143.pdf
    • https://www.linzgau-kjh.de/images/coin-master-hack-no-verification_GM406889139.pdf
    • https://www.linzgau-kjh.de/images/roblox-girl-avatar_GM431946152.pdf
    • https://www.linzgau-kjh.de/images/is-minecraft-free_GM479516143.pdf
    • https://www.linzgau-kjh.de/images/how-to-get-free-minecraft-alts_GM479516143.pdf
    • https://www.linzgau-kjh.de/images/free-coins-coin-master-2021_GM406889139.pdf
    • https://www.linzgau-kjh.de/images/free-spin-coin-master-app-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a74.bin
9f03782ff4d130bde2a34a726ab4fdf2d09d67f13d1ef27699393334787a297d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A74 25880 bytes
font_01_sfnt_off00008591.bin
0f8472b221d38b56aa502dc338bcb8175d724340a5db3d89f71a6c106e3918a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8591 18312 bytes