Malicious PDF — malware analysis report

Static analysis result for SHA-256 b155066be53bfd4f…

MALICIOUS

PDF

37.2 KB Created: 2021-05-21 13:35:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 42e012c2c030f1491876f46d6757efe2 SHA-1: c08c538c4c5b3453bafcd3fbc73b16b314553770 SHA-256: b155066be53bfd4fcd5c0bac5f6ce4eb95300956cd122376bd12a77e1a371899
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/431946152/how-to-change-roblox-username-for-free-game-hack PDF link annotation
    • http://www.viniperfetti.com/images/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.viniperfetti.com/images/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://www.viniperfetti.com/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • https://krnl.rocksIn 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_002_off0000344a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x344A 24680 bytes
SHA-256: 1b66129fe005c23e0260262306356cb6c5f6224a417b3adc126cf0e69835d24a
font_01_sfnt_off00006d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D40 19240 bytes
SHA-256: 61006e5f3dddd6435ab0a2755610421e2f864d25a13f3f522a83b1d149be9d74

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