Malicious PDF — malware analysis report

Static analysis result for SHA-256 75185bed68e0374c…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 06:07:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cb9e10d762cc9973ba5c2840beb72070 SHA-1: 93417a8cc5864b7b8b73e046c97745c958d703a0 SHA-256: 75185bed68e0374cf07e1f35000363257ab1f88030bcc5c8d7f2a3cf41b08ef7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links to known malicious redirectors and lures users with promises of free in-game currency or hacks. The document body, though partially corrupted, contains text related to 'Free Robux' and references to 'wkhtmltopdf', suggesting it was generated to appear as a legitimate document. The primary link, http://netcdn.tw/app/431946152/free-robux-websites-that-work-game-hack, is identified as a malicious redirector, likely leading to a phishing page or a download of further malicious content.

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.tw/app/431946152/free-robux-websites-that-work-game-hack In PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-get-free-visits-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/rcm-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/10k-robux-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/cheat-engine-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/hackear-roblox-robux-gratis_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/vehicle-simulator-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-robux-no-games-to-download_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/roblox-models-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-get-loads-of-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/roblox-jailbreak-hack-june_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/descargar-hack-para-mad-city-roblox_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_off0000321b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x321B 22368 bytes
SHA-256: ea33f9a8fc205a90c8a9ebcbcc8a90f2c54879d3c76cc7b0bf06747bafac50d3
font_01_sfnt_off00006412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6412 19472 bytes
SHA-256: bfabc7e6efd8369602acc342ff88857307d2346fa8526096ff81aa8b1deb03d6

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