Malicious PDF — malware analysis report

Static analysis result for SHA-256 d631f9d1f87b33bb…

MALICIOUS

PDF

43.7 KB Created: 2021-05-17 00:08:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 77939305737c36955254c725ea91ddc6 SHA-1: 800647c78d0603feb2a957b3a491ca78e5f7edcc SHA-256: d631f9d1f87b33bbb2cd5f4ce412d74b0ec70ab7e5f9aadf02cacff300be8c5c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically advertising game-related cheats and downloads. The primary lure URL, 'https://netcdn.xyz/app/406889139/free-game-packs-for-coin-master-game-hack', is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt 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/406889139/free-game-packs-for-coin-master-game-hack In PDF document text
    • https://duoledesign.com/image/data/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/free-robux-stream_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/roblox-g_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/how-do-you-get-free-food-in-coin-master_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
stream_003_off00004ab2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB2 27564 bytes
SHA-256: 1d6754e6a52cd22b8b663e62f24afb4a539965b4381c812249ad38447eb16a20
font_01_sfnt_off000088af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AF 18292 bytes
SHA-256: 588be6712b52f4dc3b6c5b8e7dc29f20d8b81f22195d0114e9c785dd726d1321

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