Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b2b945386ea544…

MALICIOUS

PDF

56.3 KB Created: 2021-05-10 23:36:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ebec7c1ffde849f7f7c8ec9c1b35e701 SHA-1: 84dfd6759d0ccddb4fe11fc59a45f7da62d7c8fe SHA-256: b3b2b945386ea5440391100c71ef9d31d09642a5137336524124a83ece259e32
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirectors and potentially malicious content, masquerading as game hacks and free spins. The primary malicious link identified is https://netcdn.xyz/app/406889139/free-spins-coin-master-legit-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at driving users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8162

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-coin-master-legit-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-tips_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/claim-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-earning-sites_GM431946152.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
stream_003_off00004bbc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BBC 31412 bytes
SHA-256: 4410ba8bf9f2715618a4365f15d6aeec0ff7241b634e5b8f5f3e908d35940afa
font_01_sfnt_off00008d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6A 3088 bytes
SHA-256: e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222
font_02_sfnt_off00009835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9835 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off0000ab5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5B 18176 bytes
SHA-256: 4f85ccc1da016ecef161eb9f79bccb20543dd347b05e2325783b5ea44e0630af
font_04_sfnt_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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