Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20dd9243df57100…

MALICIOUS

PDF

45.6 KB Created: 2021-06-08 14:41:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 02ba024d676844249dc8e7f487ca646a SHA-1: 516551a37fab0f85ff66217fe4ef144523202994 SHA-256: c20dd9243df57100a979ba3a66dd43079cfe85718dfd4d3be19fbf8e12a05e72
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into interacting with it, a common social engineering tactic. It contains multiple embedded URLs, including one pointing to a potential payload download. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent, likely to download and execute a second-stage exploit or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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.tw/app/431946152/free-roblox-hack-com-free-roblox-hack-game-hack PDF link annotation
    • http://rushxpress.de/images/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/coin-game_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/tiktok-free-mockup_GM835599320.pdfIn PDF document text
    • http://rushxpress.de/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/free-robux-place_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://rushxpress.de/images/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d76.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D76 28544 bytes
SHA-256: fed1e6ee68000c8fb8fa68f2b0d5e019a50f4b9129c41f3fadbb07834b19b490
font_01_sfnt_off00008ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA7 18608 bytes
SHA-256: 130e85de8fa29429d4a744800e573061d84539827782e8700898185430cd4f8a

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