Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dc770b69d61789…

MALICIOUS

PDF

40.8 KB Created: 2021-05-16 19:03:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ec901fbf2f638cc68bde42bdf85a74b4 SHA-1: 2b4272c07a9c2434e95d66fd1bfab7697e1c66ef SHA-256: 51dc770b69d617898cbcc7a9f25a122d1054aaed7adde0f61e21fde9a1e00fc2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free in-game currency, identified as a lure for malicious redirection. The primary malicious redirector URL is https://netcdn.xyz/app/406889139/hacks-for-coin-master-game-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive users to potentially malicious content.

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/406889139/hacks-for-coin-master-game-game-hack In PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/rape-simulator_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/robux-page_GM431946152.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_off0000479f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x479F 23808 bytes
SHA-256: d33a30e6f764fd4907b4a4d0959107f085bdbc2632ebb0268c144365ed93717f
font_01_sfnt_off00007dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCF 18140 bytes
SHA-256: 4e94fb22fc4cfc45413f7acd937baf333ca1849990841083b3aad0aa05371929

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