Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36339c9c1d2db5f…

MALICIOUS

PDF

40.7 KB Created: 2021-05-10 14:01:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 381324d7b627c6c56dbb7cb1e334e087 SHA-1: 6ea641b1b2947d4f090d2b9116321bfcc647bfa7 SHA-256: b36339c9c1d2db5fe121c7d2ef99f9b8c9ce128be3139ff329a83fcb171a12c8
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://netcdn.xyz/app/406889139/http-blackgames.us-coin-master-hack-game-hack`. The presence of a visual download button and the ML classifier's high confidence score further indicate malicious intent. The document body, though heavily obfuscated, contains references to game-related hacks and free items, suggesting a lure for users interested in such topics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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/http-blackgames.us-coin-master-hack-game-hack In PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004275.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4275 24988 bytes
SHA-256: ac7439ead9f16dffa92564e94f7734a6a4de9e6c760512db77b12e871d37b998
font_01_sfnt_off00007ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD2 19136 bytes
SHA-256: e1ce9e50dc4c3ad4d5b024a56bf1f44a8cbdcd2d74a5ef61a387106358d48fcb