Malicious PDF — malware analysis report

Static analysis result for SHA-256 9152f13e9a408fde…

MALICIOUS

PDF

47.1 KB Created: 2021-05-16 10:41:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d9abd13f0aa6d5502def71b3ff70ab0e SHA-1: 49ae2d76206a390dad9e8197e33960d5cbeed559 SHA-256: 9152f13e9a408fde7029eed8559dd9c26bf0558015744603037fe457f543ce76
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 accounts. The primary lure is a link to 'coin-master-game-hack-version-download-game-hack', which is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack designed to lead users to potentially harmful content or further malware downloads.

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/coin-master-game-hack-version-download-game-hack In PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-2021_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/how-to-get-free-coins-and-spins-on-coin-master_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_off00004de3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DE3 26696 bytes
SHA-256: 80f6dada651e7e47ff8bee2803849a7fcdb9c6e7cfcbab2e58fd5b16e6aa47e2
font_01_sfnt_off00008a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A99 2812 bytes
SHA-256: fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
font_02_sfnt_off0000943a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x943A 18692 bytes
SHA-256: bf7747fad6589835e27396875397848ee10c05064cdddbf89c0c768158d1b55c

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