Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4e6f2053775aec…

MALICIOUS

PDF

39.6 KB Created: 2021-04-23 11:31:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a2e9b65f4dde868f443c664d7a02c0b1 SHA-1: 143c1cdc07dd88b4871a52ad547600dfdc615301 SHA-256: eb4e6f2053775aec43e6fc27a207be33a9a633127401ef5659fd15fe68ed0d6d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a common lure of "free Robux" and "game hack" to entice users into clicking a link. The primary malicious URL, https://netsecure.top/app/431946152/1k-robux-free-game-hack, is flagged by heuristics as a redirector for this purpose. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.top/app/431946152/1k-robux-free-game-hack PDF link annotation
    • http://thomas-hartl.at/images/how-to-get-free-robux-using-cheat-engine-64.pdfIn PDF document text
    • http://thomas-hartl.at/images/roblox-apk-hack-2021.pdfIn PDF document text
    • http://thomas-hartl.at/images/how-to-get-free-robux-with-survey.pdfIn PDF document text
    • http://thomas-hartl.at/images/free-2021-robux.pdfIn PDF document text
    • http://thomas-hartl.at/images/how-to-hack-in-mm2-roblox.pdfIn PDF document text
    • http://thomas-hartl.at/images/roblox-scripters-for-free.pdfIn PDF document text
    • http://thomas-hartl.at/images/how-to-get-a-free-robux-in-roblox.pdfIn PDF document text
    • http://thomas-hartl.at/images/hack-to-get-robux-for-free.pdfIn PDF document text
    • http://thomas-hartl.at/images/roblox-mod-apk-free-robux-2385202134.pdfIn PDF document text
    • http://thomas-hartl.at/images/can-a-developer-give-free-gamepasses-roblox.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_off000040b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40B0 24616 bytes
SHA-256: d57c03636809f6d0abe03b314733f35f2182e12bb0e5f06b647ec5c3d1400eaa
font_01_sfnt_off00007930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7930 18288 bytes
SHA-256: 454670ef39d20d2fe0ba3a5264de6f85de00fe219085ffdb8a0782d2475cca31

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