Malicious PDF — malware analysis report

Static analysis result for SHA-256 313dcecf88ca4721…

MALICIOUS

PDF

44.9 KB Created: 2021-05-10 13:22:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2ecaeab83387c5e125898cacf77ec468 SHA-1: bc82b216607d46f43430c70f25a6dbaf8deefede SHA-256: 313dcecf88ca4721d25f374543136889c3fa6d312f18c700fd2df927db4336b8
102 Risk Score

Malware Insights

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

The document uses a lure related to "Coin Master" game hacks and generators, directly requesting "private keys" or "backup codes" which is a high-risk indicator. It contains multiple embedded URLs pointing to potentially malicious download sites, including one at `https://netcdn.xyz/app/406889139/coin-master-3.3-hack-version-download-game-hack`. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

Heuristics 4

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://netcdn.xyz/app/406889139/coin-master-3.3-hack-version-download-game-hack PDF link annotation
    • http://srisaket.nfe.go.th/UserFiles/File/coin-master_GM406889139.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/https-oprewards-com-roblox_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_off00003e8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3E8A 24920 bytes
SHA-256: bc51ecf2a29ced6236c9a7ab061cd39d55ea335678f4d7be42d752573d6b979f
font_01_sfnt_off000077e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77E9 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_02_sfnt_off00008c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C74 18668 bytes
SHA-256: c9c08938a486310b32848fcf2d5752b2e836f5cdfc047cd8e0e772ef14e34309

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