Malicious PDF — malware analysis report

Static analysis result for SHA-256 3199a7c9987b986f…

MALICIOUS

PDF

43.3 KB Created: 2021-05-12 07:35:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0f4e3675e270549f3e3166e0736aedf6 SHA-1: f0a260b25ea1457aa1459ecb33790937753a3ad4 SHA-256: 3199a7c9987b986f791511c35bac08d54d3f8dad2c25f465dbe21dc60a81cb6e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and currency. The primary malicious URL identified is https://netcdn.xyz/app/431946152/robux-no-human-verification-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attack designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/431946152/robux-no-human-verification-game-hack In PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/roblox-re_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/free-robux-videos_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/free-coin-master-credit_GM406889139.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_off00004c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C0C 24944 bytes
SHA-256: c5cff3851f505edfb4bdc53b668ddc50025f8703c259c51c6eda73392ca9c128
font_01_sfnt_off0000857a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x857A 18696 bytes
SHA-256: b0b7efb10b2be72ca1f11f5058a16b7f706f868f5fc2e7590f71e4c885e22b6d

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