Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5818cee60cebd12…

MALICIOUS

PDF

36.9 KB Created: 2021-07-20 00:25:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 96594c3b01372bc13494a6b5b04a302c SHA-1: 435b769600fac643d1b2c96b5f738ded1501b855 SHA-256: a5818cee60cebd12be214c010b0ebf887e3a8b2108975600a7b86d03361c875c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free Robux' for the game Roblox to entice users. It contains multiple embedded links, including a primary redirector at http://netcdn.tw/app/431946152/roblox-free-robux-codes-game-hack, which likely leads to a malicious site or further download. The document body and heuristics confirm the malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://netcdn.tw/app/431946152/roblox-free-robux-codes-game-hack PDF link annotation
    • http://www.actae.gr/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.actae.gr/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.actae.gr/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://www.actae.gr/images/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.actae.gr/images/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://www.actae.gr/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://www.actae.gr/images/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.actae.gr/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.actae.gr/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://www.actae.gr/images/blox-fish-free-robux_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
font_00_sfnt_off00003ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AB5 22840 bytes
SHA-256: 92dd0eaf78dbd4f0009cbaf5dd93f9fff4766d8a79a1442d8f1ced76086c0563
font_01_sfnt_off00006e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E33 18448 bytes
SHA-256: e529cb40a530da961a087a0762f87fb9b1aac153c26bd7c52945be752f3c1fb1

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