Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfce589483d0839…

MALICIOUS

PDF

51.2 KB Created: 2021-06-08 13:25:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5e58e64ec63c47eae712dcc31aad7abe SHA-1: d3287fc35c02b92f6e00b292b218970167e2c62b SHA-256: 7bfce589483d083967280e0cbec2e1c990648cb825d932fe058cf3d06fc865d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-item-codes-roblox-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering attack designed to lead users to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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.tw/app/431946152/free-item-codes-roblox-2021-game-hack In PDF document text
    • http://www.marambio.com.ar/images/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-for-free-generator_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://www.marambio.com.ar/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F9 26104 bytes
SHA-256: 2d2c446cd88d99e441828a3be0d2c2ee33e1b3ea02ba40ba50f5baded1cb3804
font_01_sfnt_off00008c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C96 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9642 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA354 18888 bytes
SHA-256: c486e75127123b4479ed81da5b44d8f18c8f93c3f5ce736f5c908744761ed103

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