Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c6421fd621ed2d…

MALICIOUS

PDF

35.0 KB Created: 2021-06-27 17:23:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4db673be4e7711a94d37e229032806d7 SHA-1: d1a5510b2d0253e3623d8143772eacc8a197e0ca SHA-256: 09c6421fd621ed2dcb2ab2d2a1abed7de89f61282a2fe2dedb3eeffeba1652f9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free Robux' generators. The document body and embedded links suggest a lure to trick users into visiting a site that likely hosts a malicious payload. The ML classifier also strongly indicated maliciousness.

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-get-free-robux-by-doing-this-game-hack In PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/i-will-hack-and-not-kill-parent-fashion-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-game-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-v3rmillion_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/dbz-final-stand-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-human-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-robux-hack-2021-pc_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robloxcom-free-avatar_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-working-roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spons-apk-2021_GM406889139.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_off00003184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3184 22000 bytes
SHA-256: e19de1720138917625ee407ff33f09efc12dad41672042d77ccb869cbcf07243
font_01_sfnt_off00006239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6239 19620 bytes
SHA-256: 729b1868ce9c468098e8f07eae4a64a878bcb4604fc75e8597f08f3e5c69a384