Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbf4e786338bc0b…

MALICIOUS

PDF

37.2 KB Created: 2021-05-20 23:44:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2270ecce92b97187e53fb02314efc053 SHA-1: 0d52b61655d0d480a1a2e11f7ac312ee58243a20 SHA-256: 3fbf4e786338bc0bdb0f1ceca5975a5c277a3807e5d185bfa978c3c583b54b3c
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-do-you-get-free-robux-without-paying-game-hack PDF link annotation
    • http://thamelinn.com/userfiles/files/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/robux-free-com_GM431946152.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_002_off0000317e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x317E 25000 bytes
SHA-256: c12e34f3fcb80fdb23a218c350155c10dc0c8914111dc29310633beaa5b0a811
font_01_sfnt_off00006b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B20 19948 bytes
SHA-256: 5d1001e3ac77277796354ae1628373f4f4a3ba3fa344903a86c4555bafe1b783

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