Malicious PDF — malware analysis report

Static analysis result for SHA-256 d739d79a945d322a…

MALICIOUS

PDF

44.8 KB Created: 2021-05-17 17:36:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 54a0a893c7fda5cb6aadbc3b9d3e02b8 SHA-1: dd46942b2f1715ea9210ed8c17af4f0d65ff1e28 SHA-256: d739d79a945d322aa3b603dee33c62922df2626fb1dbc3c854b6a97057498b89
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The document body and heuristics indicate a lure for free game items, likely leading to a phishing or malware download site. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/coin-master-free-online-game-hack In PDF document text
    • http://pietroubaldi.org.br/images/give-me-robux_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/daily-spin_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-800-robux_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004933.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4933 25804 bytes
SHA-256: 369b08aae5634fce11c5d4eb1eafadd4b496e7559909585b5375269d5c5eac20
font_01_sfnt_off000082f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F6 3204 bytes
SHA-256: 8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa
font_02_sfnt_off00008df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF9 17784 bytes
SHA-256: 5cb4b072a296e1d0a116510b6a928a0a81b450dccfe828cef627c6c52934b7a2

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