Malicious PDF — malware analysis report

Static analysis result for SHA-256 81870243c8252a7e…

MALICIOUS

PDF

46.8 KB Created: 2021-05-19 07:15:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 35686502b84ca48edf1765804a6f10c7 SHA-1: acca643f3c0e54c79aebced531ab7415c7471dea SHA-256: 81870243c8252a7ee8e5282c6c38e6c00eee1bf67e27b0baa8868df521f0e95f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially malicious websites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/free-spins-link-in-coin-master-2021-game-hack In PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-roblox_GM431946152.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/oprewards-login_GM431946152.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-spins-for-coin-master-2021_GM406889139.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_off00004d9e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D9E 26116 bytes
SHA-256: 0a4989b76b724ebb8bea913eaa0c9b59d6e2470bd5dc7c50eca626c4e1f914e0
font_01_sfnt_off0000892f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x892F 18456 bytes
SHA-256: 8f5be0faf1f43547a4f613946690c49555a623d75ecb5c591eda2449b2cabce1
font_02_sfnt_off0000abc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC8 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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