Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90cf5158442bf14…

MALICIOUS

PDF

33.3 KB Created: 2021-07-08 19:12:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c43d007d7be6d2b93916e643f0b13bbc SHA-1: efcdb5ab29bd0313349464e0ddf54fc7690b27cb SHA-256: c90cf5158442bf144f99691aad45f0f7f05894ffe555045e0c39dd608165b9b6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector. The document body and heuristics indicate a lure for free game items and hacks, specifically targeting popular games like Roblox. The primary malicious link, http://netcdn.tw/app/431946152/free-robux-youtube-game-hack, is designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of malicious links and the lure strongly suggest a phishing or scam attempt.

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-youtube-game-hack In PDF document text
    • https://www.knjiznica-oroslavje.hr/files/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/simplysarc_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/can-you-still-make-free-roblox-shirts_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-roebucks-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/gym-simulator-2-hack-roblox_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/tiktok-free-pc-download_GM835599320.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-hack-2021-no-survey-no-password_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-girl-body-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C35 22048 bytes
SHA-256: a7ebcc79274048b075460b382dd01df7b426e5f46301e6f75d3ad68f25403510
font_01_sfnt_off00005d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0B 18984 bytes
SHA-256: 8bebb17fd92d279e9d491e2d23a61c4ead6df9403511c12439d4cdab80b3a674

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