Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e83f7c49252e25…

MALICIOUS

PDF

38.5 KB Created: 2021-05-21 04:53:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f569710ad4f77b1366f5515207042b37 SHA-1: 1999f0feb01d6dcc7394c281095a2defe1684b61 SHA-256: a5e83f7c49252e25383a9f4af4f234dd20d466ca6cd92c763b51ecf39438c228
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 0.9476

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/835599320/free-likes-on-tiktok-game-hack PDF link annotation
    • http://sfera-express.ru/images/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/free-minecraft-hosting_GM479516143.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_off000030f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30F7 33384 bytes
SHA-256: c46db7a4b532235a22a9748f84b6ab32edc025af854460e32dc9bdd6b7f67d82
font_01_sfnt_off0000780a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x780A 17456 bytes
SHA-256: 68a974c9aa3c870eecc965d525ccb957938ff5f02ba9183d05fa54c35671def6

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