Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e943e5afcd05fd…

MALICIOUS

PDF

35.4 KB Created: 2021-06-27 15:59:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a3a5f17b841ccca899948a4a144887c0 SHA-1: 6aef06347ad7fa4fd7287464b9dc060b29af0f56 SHA-256: 66e943e5afcd05fd6dc330efa4e42409d91cecf37c9e8256389047e3bd885120
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures for popular games like Roblox and Coin Master. The document body and embedded links reinforce this theme, aiming to trick users into clicking through to potentially malicious sites. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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-get-free-roblox-items-2021-game-hack In PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-robux-in-roblox-on-ipad_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-btools-hack-november-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-source_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/pubg-uc-add_GM1330123889.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/minecraft-windows-10-free-with-java_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_off00002fd8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FD8 23076 bytes
SHA-256: 9a7c1a9117d6245ec46b7e9e90841936b70350d46a061bb83b1ff4c9e4b34e10
font_01_sfnt_off000063a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A9 19580 bytes
SHA-256: 6cc3dc6f5172005bb3d655e02add094c3d06477b58e72056de28f9ff38e8f5c0

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