Malicious PDF — malware analysis report

Static analysis result for SHA-256 055b4eea5a032539…

MALICIOUS

PDF

44.3 KB Created: 2021-06-09 14:33:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4505a0639c636f06f732633a81141a51 SHA-1: 6cde9fd6c0ba69d9e545f07c5591344677437fbc SHA-256: 055b4eea5a0325399c0f7a3bfec3610f0304a6175b3e13a258f0f2c45032bcff
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, specifically promoting 'game hacks' and 'unlimited Robux'. The primary malicious link, https://netcdn.tw/app/431946152/hack-to-get-unlimited-robux-free-game-hack, is identified as a known malicious redirector. The document body, though partially corrupted, contains similar lure text and URLs. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/hack-to-get-unlimited-robux-free-game-hack In PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-roblox-characters_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-home_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-roblox-groups_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50B3 25136 bytes
SHA-256: ba1eb94a7e9737d8743ce077efebf25e93aa60951088602894b76832cc5333ef
font_01_sfnt_off000087a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A1 19328 bytes
SHA-256: cffae92082217095bbe2d4d0442bea39ab3f3003bb2f71c248e9aced188353cb

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