Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a187f7d2ce942cd…

MALICIOUS

PDF

39.2 KB Created: 2021-05-14 17:39:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 558631e90e599632f0a930420379a419 SHA-1: 6d24a1feb946ad50b02adf9354e5e2f93ef071d3 SHA-256: 5a187f7d2ce942cdd59454e3bb9e92b44de139b51aae66aaee5e0e8f3d5ab8f5
70 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://netcdn.xyz/app/406889139/hack-coin-master-site-rssing.com-game-hack'. The document body also contains text and a button-like phrase ('CLICK HERE TO ACCESS COIN MASTER GENERATOR') that suggests a social engineering lure, likely to trick the user into clicking the malicious link. The PDF structure and embedded content are consistent with a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0127

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/406889139/hack-coin-master-site-rssing.com-game-hack In 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_off0000330b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x330B 26472 bytes
SHA-256: 8f392920a65ad1c93db13831a37726a87fcab6ddcbc9c6583bdb410b05ffbdac
font_01_sfnt_off00006dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEA 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000779c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x779C 18328 bytes
SHA-256: 07de35e017b3498320b231462ac397ae59ca2d27503cc9a48e7a5c4c16f0becc

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