Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90f6ae415c9535a…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 01:38:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1785a13354d81709dc284a70ac64dc02 SHA-1: 172c2c2ad2d171b63536f1f0b6cf6275b622cbed SHA-256: c90f6ae415c9535a97f74d1240e960a71beb68bc6a3033dc5f4c1ca32bc8f949
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting game hacks and free currency generators. The primary redirector URL is http://netcdn.tw/app/431946152/roblox-sexually-abused-game-hack. This indicates a social engineering lure designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of malicious redirectors and the lure content strongly suggest a phishing or scam campaign.

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/roblox-sexually-abused-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/flame-gg-hack-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-download_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/claim-free-robux-roblox-rewards-http-bit-ly-2tuy5lz_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-fly-hack-not-a-virus-flood-escape-2_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/near-tiktok-free-view_GM835599320.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-codes-2021-june_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/admin-commands-roblox-free-robux_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_off00002fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEC 22316 bytes
SHA-256: 1a9e1f28e2ff0822a6f7f33405d07735bf76359b94b090293f9dc0c1c8339fb3
font_01_sfnt_off000061be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BE 18980 bytes
SHA-256: c3252d2785156bbbf2f5fed85c274c2188c0aa1895499f3c1992a6124307eaa5

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