Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b77a1e058ef478…

MALICIOUS

PDF

45.0 KB Created: 2021-05-19 09:49:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 11acc3305d0d912e99001f70b049b3f1 SHA-1: f0bf9a7066dfd9f7c9fc9658e39ca25686672850 SHA-256: f4b77a1e058ef478b16a0ea445284e282604f80614dd2e25a42e7b05fb69b46b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free spins" to lure users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt, likely intended to lead the user to a site that may host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/twitter-coin-master-free-spins-link-game-hack In PDF document text
    • https://www.tdbaska.hr/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-robux_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://www.tdbaska.hr/files/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • https://www.tdbaska.hr/files/roblox-free-printables_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.tdbaska.hr/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/roblox-online-free_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a14.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A14 25096 bytes
SHA-256: 14e9494574da2612026a046b3cc700914932b232937a2a2df38e36f20bca6523
font_01_sfnt_off00008398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8398 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D83 18220 bytes
SHA-256: 52ffbd88cc2cac306fe82121e7a954d434fc7a4bd2ad0f2292b5f4c74619d21b

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