Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d28f5ab520fed85…

MALICIOUS

PDF

45.3 KB Created: 2021-05-11 18:50:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5415effcc96d82239467f0fc72cfe7c1 SHA-1: d1c549539f0f2fbdf2d011369554446c5f570fba SHA-256: 4d28f5ab520fed85fb1a2b8e38504a162938cb9ac177839c967cd4762bd5d08f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a call-to-action lure for a "free Robux generator", which is a common theme for scams. The primary link redirects to known malicious infrastructure, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful sites.

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 https://netcdn.xyz/app/431946152/free-robux-generator-2021-no-human-verification-or-survey-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-generator_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-hack-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
stream_003_off00004a6c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6C 27556 bytes
SHA-256: 4005bcd5ea22a985dbda9ea240149e6abd324b9905c16394a39395f8ca883f83
font_01_sfnt_off00008af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF6 19556 bytes
SHA-256: 76adbda1d3e57e3064df3e292cf485a94c26c1a96e5d3a4e3c484cd1a4e129d0

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