Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5706c57907d0e1…

MALICIOUS

PDF

33.4 KB Created: 2021-07-03 17:38:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d50bf45e29dac4ed28cdf3c9123561d6 SHA-1: 2ee9040b9b7e0ca230f927db8de56e14054da71a SHA-256: ff5706c57907d0e1e0cf6c0b3c88f1c57fd4245c93f5ffbec438449b54c8614e
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 websites, many of which are SEO-optimized to appear as legitimate guides for obtaining free in-game currency or items. The ML classifier strongly indicated maliciousness, and the presence of a download button lure suggests a phishing or scam attempt. The primary goal appears to be directing users to download potentially harmful files or visit malicious sites under the guise of offering free game-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/how-to-get-free-robux-2021-no-human-verification-game-hack
    • https://morishita-tc.com.tw/image/data/files/free-mojang-account-with-minecraft_GM479516143.pdf
    • https://morishita-tc.com.tw/image/data/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/how-ro-gwet-free-robux-on-tablet-2021_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-in-tower-of-hell-roblox_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/cute-free-stuff-on-roblox_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/roblox-avatar-maker-free_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-minecraft-realm-codes_GM479516143.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-cheat-engine_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-have-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/roblox-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-free-spins_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-hacks-that-actually-work_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/legit-free-spins-coin-master_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-2021-app-download_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-100-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/roblox-no-clip-hack_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/roblox-tab-font-free-download_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/can-i-get-robux-for-free_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/robux-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/roblox-free-robux-generator_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b72.bin
0ddac04cdbd69f722765b74b3374a2d3d300a7c6c6052fe6368f48f5136f040e
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B72 21692 bytes
font_01_sfnt_off00005b2f.bin
73ca12d001f484cb7e916eddfb38cb68c81d0268ac20e02f4c1cc4bb789b0b63
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2F 19900 bytes