Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d77d3815714874…

MALICIOUS

PDF

42.7 KB Created: 2021-05-13 02:00:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: acf8074fbf9ccc9c5b194257bd5ac5e5 SHA-1: 2a9490643f78828312a653e532f4d87c12abf1e5 SHA-256: 52d77d3815714874830cb662c79e9f26539860a681a31119c99b4fdf5ca12c4d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting game hacks and free generators. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are consistent with a social engineering lure for obtaining in-game currency or cheats, likely leading to further malware or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/krnl-download-game-hack In PDF document text
    • http://medinup.pt/images/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/what-is-coin-master_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/rbx-free_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-android_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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
stream_003_off0000490e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x490E 25784 bytes
SHA-256: 31487a8de3690e89a585a243bfbbd0dd4e331c2ef72c15b4b8a19d0c83a70db3
font_01_sfnt_off000084ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84AE 18152 bytes
SHA-256: dbb65ef0ffb84904a2a414ea884afe25cc8f4fd70881af36030310af4144951c

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