Malicious PDF — malware analysis report

Static analysis result for SHA-256 c075a25fde91655a…

MALICIOUS

PDF

33.6 KB Created: 2021-07-09 22:22:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6a8761ac046b77b49cb130c08a756f3e SHA-1: faff71b1a089e75b3196ed3b1c52e0303c1c9dc3 SHA-256: c075a25fde91655a111490458bad71be6e651cb31f7ce7f7a4163fa9ffd6d31e
160 Risk Score

Malware Insights

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

This PDF document employs a lure of free in-game currency and hacks to trick users into clicking a link. The primary link, http://netcdn.tw/app/406889139/free-coin-master-spins-hack-game-hack, is identified as a malicious redirector. While no scripts were directly extracted, the PDF structure and embedded links suggest a potential for exploitation or further redirection to malicious sites, likely involving JavaScript for execution.

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/406889139/free-coin-master-spins-hack-game-hack In PDF document text
    • https://www.ocic.hr/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/hair-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/roblox-hack-no-survey-no-verification_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/freerubux_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • https://www.ocic.hr/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/roblox-free-roam-games-grand-blox_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/how-to-get-the-roblox-sex-hack_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/invisible-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/roblox-noclip-hack-november-2021_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/roblox-games-for-girls-free_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/best-hacked-client_GM479516143.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
stream_002_off00002dbf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DBF 22640 bytes
SHA-256: 87038c68c02dcef2a4f9843cf2228d04377d9da938ba12f97fa9352dbf87eab7
font_01_sfnt_off00006051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6051 18344 bytes
SHA-256: 4d0657ae61433a99d4c3f327acf405e508756c248fc53430885ddf01c25216ba

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