Malicious PDF — malware analysis report

Static analysis result for SHA-256 21093ab590352ccb…

MALICIOUS

PDF

54.2 KB Created: 2021-05-15 13:37:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7ae9fbb54ef5d4e17f492ccec45d0a0b SHA-1: ed03900c14c32bf26e481d2acd122678d4cf7254 SHA-256: 21093ab590352ccb7a25d669ae7f7d082eadabdbee4adac0f040ca4d1b095f48
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free spins" to lure users. The primary redirector URL identified is https://netcdn.xyz/app/406889139/spins-gratis-coin-master-hoy-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or social engineering attack aimed at driving traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

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/spins-gratis-coin-master-hoy-game-hack In PDF document text
    • https://info-zentr.ru:443/images/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/wurst_GM479516143.pdfIn PDF document text
    • https://info-zentr.ru:443/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF4 25208 bytes
SHA-256: 775c38e8b4b7b0bcf8979bcd0c178179ae4539a0bd68bdeb570bab500d6096a3
font_01_sfnt_off000085c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C9 3088 bytes
SHA-256: e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222
font_02_sfnt_off00009094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9094 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off0000a3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BA 17900 bytes
SHA-256: d9ca9c840088eace307b9f0f2308e23842d7b880bf99d309ad40adeb9b769765
font_04_sfnt_off0000c4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AC 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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