Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff452bc731d8c9d…

MALICIOUS

PDF

40.7 KB Created: 2021-04-22 16:03:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1c7412e43ebb28ce054c2d70ce4b3854 SHA-1: c6ecea2b82d4677818e5059a30f926063637a1ec SHA-256: bff452bc731d8c9df1ca5285c66188136f3e259d29a7b4284e3b408bd2314f62
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 0.9945

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://netsecure.pro/app/431946152/cheat-roblox-jailbreak-tembus-2021-game-hack PDF link annotation
    • http://sbm-nn.ru/images/how-to-get-robux-for-free-2021-no-survey.pdfIn PDF document text
    • http://sbm-nn.ru/images/hacked-roblox-2021x2021.pdfIn PDF document text
    • http://sbm-nn.ru/images/bleus-free-robux.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-on-iphone.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-on-cbro-roblox.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-de.pdfIn PDF document text
    • http://sbm-nn.ru/images/aim-bot-hack-on-roblox.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-the-roblox-buy-button-with-inspect.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-do-you-get-free-robux-google.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_003_off00003eaa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3EAA 25692 bytes
SHA-256: ea43ad1272e6ed7e13f75a38911119ca6adfedffa620faaaeee10f5359197d48
font_01_sfnt_off0000798a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798A 19540 bytes
SHA-256: 10ee854c367b482c2c7db6c75284f5f01b91599efa3c2239e533c399e627db5a

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