Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ee720fc410b492…

MALICIOUS

PDF

38.0 KB Created: 2021-05-22 18:05:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7746128a165accead03d0871477a68f1 SHA-1: 7353f1236699b5e392193f7c8cfd77db17bc8754 SHA-256: 23ee720fc410b49288503564839f746570f2b84d7ebaa7fc074ec24955d3468b
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 0.9407

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/406889139/daily-free-spins-for-coin-master-game-hack PDF link annotation
    • https://e-learning.mtsduktb.com/__statics/gudangsoal/files/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsduktb.com/__statics/gudangsoal/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsduktb.com/__statics/gudangsoal/files/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsduktb.com/__statics/gudangsoal/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsduktb.com/__statics/gudangsoal/files/how-to-hack-coin-master-using-es-filer_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_002_off000033ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33AD 30200 bytes
SHA-256: 2ef5ef9de4c1cd8421ae8de87ac27b047724ec546234db504c4981b394431c1c
font_01_sfnt_off0000735c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x735C 18308 bytes
SHA-256: b750d5a8b44caccc122b2ff8294eb9307e18e87e3916697a2a7f0c063c77f291

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