Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4558aa8d111357d…

MALICIOUS

PDF

33.5 KB Created: 2021-07-19 18:02:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5827461e6a1f331c3e5fd0bf716c034e SHA-1: b13e1ca2be2660c0406d9045f158a22f2ed439ee SHA-256: d4558aa8d111357dacc7882bfceb61ed4ea8db6517aa21a347eeddf9e03804ea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising "free Robux generators" and "game hacks". The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely serve as the initial lure to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.tw/app/431946152/free-robux-generator-no-human-verification-2021-game-hack In PDF document text
    • https://pedungan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://pedungan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • https://pedungan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://pedungan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • https://pedungan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://pedungan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://pedungan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://pedungan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://pedungan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://pedungan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-generator-2021_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_off00002c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C32 22288 bytes
SHA-256: a65aaa41c60394ee736580f09e6d826fa7ac9428a1286ec1ad2777570dbd2b59
font_01_sfnt_off00005d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D74 19448 bytes
SHA-256: c4f235c6325a062dfb1dc9d53c980481f8635b4baeb4de16fff816f4c5634972

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