Malicious PDF — malware analysis report

Static analysis result for SHA-256 4349f47cd80c9ed1…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 14:38:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 63c06297472a06eca96355efcc352691 SHA-1: ac26d84421dff78996201338cd749f7772a9a92c SHA-256: 4349f47cd80c9ed1acd18f321638d9bf82b5e662f299eebab6ad339545674c5a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains numerous links to external PDFs, many of which are SEO-optimized with keywords related to game hacking and free virtual currency. The primary URL, http://netcdn.tw/app/431946152/free-robux-that-actually-works-game-hack, likely serves as a landing page or download source for a payload. The ML classifier strongly indicated maliciousness, supporting the interpretation of this document as a lure for malicious downloads.

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.tw/app/431946152/free-robux-that-actually-works-game-hack
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-roblox-2021_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-daily-gifts_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-cheat-in-roblox-tycoons_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-people-on-roblox_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/creator-of-slx-roblox-hack_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-without-email-address_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/get-free-robux-without-human-verification_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/jailbreak-roblox-hack_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-muscle-t-shirt-roblox_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/robux-hack-no-human-verification_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/today-free-spin-coin-master_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/easy-robux-today_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spin-and-coin-links_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/how-do-you-get-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/robux-gift-card-free_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/apps-for-free-spins-on-coin-master_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-codes-and-obc_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-with-no-survey_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coinmaster-blogspot_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003160.bin
92402d5aff6d61ff29cdd14c03ecc2541c614ae24972542c1990d42fa9c4360a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3160 22512 bytes
font_01_sfnt_off000063d8.bin
d52712f1a35e8680be3c45e78173014feb66661a2560c5e73c6934237b8ae3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D8 19608 bytes

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