Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e635fe2ab5b6589…

MALICIOUS

PDF

41.2 KB Created: 2021-05-11 02:01:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c48abdb9908f07801f6bd1bee2f6617d SHA-1: 090f96ea314e188c945d0a993c31269cca18cef7 SHA-256: 4e635fe2ab5b6589b0266b611182b222f790d802a3338cc3f55bb1d71d84709b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to known malicious redirector infrastructure, which is designed to lead users to download potentially harmful files. The presence of a visual download button further supports the lure, indicating an attempt to trick the user into executing a payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9826

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.xyz/app/479516143/wurst-1.8-game-hack In PDF document text
    • https://adventureglaciertreks.com/userfiles/files/games-for-robux_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004028.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4028 24332 bytes
SHA-256: 95e744956bdde6200bbe12c11846e3dc1e57fb126ec32ff486b907a1f15e8c29
font_01_sfnt_off00007692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7692 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00008032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8032 17940 bytes
SHA-256: 9ddf50010538257863564cc063c7bcca2c638885d8ca6ab03dd967993225e6a2

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