Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3cfbebc5439caf…

MALICIOUS

PDF

35.3 KB Created: 2021-06-29 07:58:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1eeeaa497e3deec22373b8e6a4774c9d SHA-1: 0ca2bd530a2e5ef3070162cf35be9fc605f73ea3 SHA-256: 5f3cfbebc5439caf3e210f3274e48c010d65c4f15aa96946b6eac04c227ed324
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a lure related to "game hacks" and "free Robux" to entice users. It contains multiple embedded URLs, with one identified as a malicious redirector. This redirector likely serves to deliver a secondary payload or lead the user to a phishing page. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.co/app/431946152/how-to-hack-in-somebodys-roblox-account-2021-game-hack In PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-cash-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-free-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/bubbly-animation-roblox-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-get-a-roblox-mad-city-money-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-radio-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/get-free-robux-march-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-shirt-template-designs-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-robux-games-that-work-no-password_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/robux-hack-thumbnail-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/como-conseguir-robux-gratis-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-hack-arsenal_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-free-items-generator-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-roblox-codes-for-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/comment-tre-un-hacker-sur-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-roblox-for-6-year-old_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

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
font_00_sfnt_off0000302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302E 22300 bytes
SHA-256: f8e53123d3311389bc084cbf62e0fde6251ce84cd2c37b7ad6043e2d8eb4540a
font_01_sfnt_off000061c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C2 20080 bytes
SHA-256: e74c0ce1593b12d41a638e33c88a6cd54e9fe95a6f11b91eab46aa1b1b302c1e

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