Malicious PDF — malware analysis report

Static analysis result for SHA-256 6315dda5622df925…

MALICIOUS

PDF

34.1 KB Created: 2021-06-27 01:42:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5386d8f35439c96a1aeab9a95b3f451d SHA-1: b1002da1b84d21649d1c2d93a420892f2fa16690 SHA-256: 6315dda5622df92508e8401ad929f9e3bb4be4aec56e10a10e7876c1dfb1acea
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are structured as SEO-optimized links pointing to game-related cheats and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or phishing attempt. The ML classifier also flagged the document as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the document's structure suggest an attempt to direct users to external, potentially malicious, content.

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/comment-hack-roblox-unboxing-simulator-game-hack
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-link-today-new_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/martian-lettuce-coin-master-free_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/2021-free-spins-coin-master_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-apk-free-download_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/roblox-gift-card-online-free_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-daily-free-spins_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/cheats-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-hacks-no-downloading_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-real_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/robux-free-no-survey-real-2021_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdf
    • https://morishita-tc.com.tw/image/data/files/robux-generator-com_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-without-verification-or-survey_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-links-to-free-spins_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/a-lot-of-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-not-fake_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-roblox-injector_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-face-roblox-makeup_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f7f.bin
8643e2c37053ebb71c2e76f05554adff306ad61a8d2532618f1ff352d21a9d5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7F 21860 bytes
font_01_sfnt_off00005f66.bin
ca5f76c36b7a814f66f600271cd5abbff237708215075eef08f1b51fa540a72c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F66 19280 bytes

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