Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4504e6caa8154d…

MALICIOUS

PDF

36.9 KB Created: 2021-07-08 10:31:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c388e77725df17a804c04a89f1f9e9c8 SHA-1: 30cdfb0b9ac915512fb9a0056ea87cc0a5207ab3 SHA-256: ba4504e6caa8154d180810f221d9c661437b0c8983ece38e56d30f91dcabcf34
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-spin-free-game-hack, which likely serves as a gateway to further malicious content or exploits. The ML classifier also strongly indicated maliciousness, supporting the classification of this PDF as a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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 http://netcdn.tw/app/406889139/coin-master-spin-free-game-hack In PDF document text
    • http://energyx.com.tw/image/data/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/row-blocks-free-games-at-robloxcom_GM431946152.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/roblox-robux-genorater-hack-byhttp-robloxrobuxgamehackco_GM431946152.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/phantom-forces-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/freespins-coin-master_GM406889139.pdfIn PDF document text
    • http://energyx.com.tw/image/data/files/earn-robux-today_GM431946152.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
font_00_sfnt_off00003121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3121 22628 bytes
SHA-256: 83c7ad89a15d2eeec1691733a06f6986c81dc0747d88707e459792b0fc362d34
font_01_sfnt_off000063cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CD 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB2 18176 bytes
SHA-256: 9d64f59deaede30a08c34bcec3da02112a68e9d41babb799f745357d62befbf6

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