Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cb6b573d072d0e…

MALICIOUS

PDF

46.1 KB Created: 2021-05-13 06:43:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5ff82616b97e5058168702b80fa195df SHA-1: 70bb9a5b99ee548a8562e33685ccaef2d1b04961 SHA-256: a4cb6b573d072d0e73b4e1fc08ef7cd7d5fc5a204a4e116e7ca4c7577ee0093e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external URLs, including a primary redirector associated with malicious activity. The document body and embedded links suggest a lure for free game currency or hacks, designed to trick users into visiting potentially harmful sites. The ML classifier also flagged this PDF as malicious, reinforcing the assessment of a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/431946152/free-robux-codes-no-verification-2021-game-hack In PDF document text
    • http://linde-erbach.de/images/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://linde-erbach.de/images/robux-gratis_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://linde-erbach.de/images/minecraft-free_GM479516143.pdfIn PDF document text
    • http://linde-erbach.de/images/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • http://linde-erbach.de/images/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://linde-erbach.de/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/free-coin-master-spins-hack_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_off000049df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DF 26104 bytes
SHA-256: 66f9c880e4fa1ecb696680f2d7b858c8050c0f009e6410c8b0f46d85b3ddd2fa
font_01_sfnt_off000084e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E3 2840 bytes
SHA-256: 787e0768241fb57660bcc9c7f726cf687277c463cdf8c586c4782ee9d03c3606
font_02_sfnt_off00008ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA2 19176 bytes
SHA-256: db1e34f64d78c47646929d75ef8e7d82dfccacc985d29653851fea35b3c0bf96

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