Malicious PDF — malware analysis report

Static analysis result for SHA-256 1494278a5ba4b7a9…

MALICIOUS

PDF

33.8 KB Created: 2021-07-02 04:07:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a50dfb47c95162809a389b46f611f654 SHA-1: b7edd97b4ca3197bd91a4d846ee22987c6d0ef9f SHA-256: 1494278a5ba4b7a9acc9e537858169e3718a1146bad50254a84351aff15e90c5
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are presented as PDF files related to game hacks and cheats. The primary URL, http://netcdn.co/app/431946152/robux-generator-2021-free-game-hack, suggests a lure for downloading a malicious application disguised as a Robux generator. The heuristic PDF_SEO_LINK_FARM indicates a large number of such links, reinforcing the malicious intent of directing users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/robux-generator-2021-free-game-hack PDF link annotation
    • https://cogp.greentrade.org.tw/image/data/files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-hack-roblox-app_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-printable-roblox-coloring-pictures_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-slurp-hack_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/rbxfree-com-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-attacks-coin-master_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-punch-animation-roblox-r6_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F70 21564 bytes
SHA-256: 384db92a05118594dc00a393a90dfbdc9b6405f5a86763d01252d41372b5d0f8
font_01_sfnt_off00005e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E51 19224 bytes
SHA-256: 14ebda6235cb8e1bd4b9d5f42ec0ef7c5c14450fe991098c01b331433f91bc5c

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