Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca1be97e314f56c…

MALICIOUS

PDF

35.3 KB Created: 2021-06-29 16:15:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6c70da9924900d01174315f0f797b67a SHA-1: e14ebf5a8975d7f4cd007245f74ab626265249eb SHA-256: 4ca1be97e314f56c02f312dc4d04afbad678221020dfb6616034b5ececa1092a
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to external URLs, including a known malicious redirector, under the guise of game hacks and free Robux. The primary lure appears to be http://netcdn.co/app/431946152/how-to-hack-the-living-dead-roblox-game-hack, which is likely used to deliver a secondary payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/how-to-hack-the-living-dead-roblox-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-game-advertising_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-robot-animation-free_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/krnl-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/android-oyun-club-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-tix-hack-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-hack-on-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/10-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/list-of-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-zombie-attack-hack-script_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-hack-cf_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.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_off00002f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F0A 23148 bytes
SHA-256: be565fc236b5c5689269b253688ab89ef99c16b40862c5b629c22f9e87f325d6
font_01_sfnt_off0000635e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635E 19564 bytes
SHA-256: 2af8a9da4b7a006fec42d6adba53094f7069dcd9709722c1c3bfa66c2dd8aa09

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