Malicious PDF — malware analysis report

Static analysis result for SHA-256 611855e875acacc2…

MALICIOUS

PDF

41.6 KB Created: 2021-05-10 15:01:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dd2e5f813f587a3bfeb4e9405bcec084 SHA-1: 187cefa61e33ce7fc9e5e3a6600a869d3e1f77c4 SHA-256: 611855e875acacc231620cf2e59496a2c983f6996dcf31001a9af1e840af046d
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 0.9974

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/best-way-to-get-robux-game-hack PDF link annotation
    • https://www.efeskbb.com/upload/content/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.bandicam.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000430a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x430A 26552 bytes
SHA-256: dd92e5751515aece273c54efa081e9294e5b98033f756f4bd82f1636e9cb78e5
font_01_sfnt_off00007f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F70 18560 bytes
SHA-256: d4298167564158e2fe6287b202ed8cba1ae7047430a0487301977ebc109c0fc7

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