Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cb61254d65416b…

MALICIOUS

PDF

48.5 KB Created: 2021-05-13 17:30:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f678dc631592bf04da203ed846a21d7a SHA-1: cdcfa3730f4e4553245d74141ea466a67d8cb9bf SHA-256: 82cb61254d65416b2a7939399f2b1c328529ced9cb61a6c808bee6393933f09d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a primary URL pointing to game hack and cheat download sites, indicating a lure for users seeking such content. The PDF_SEO_LINK_FARM heuristic firing suggests a large number of these links are present, likely to create a link farm. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/roblox-hack-codes-game-hack
    • http://www.himalassociation.org/himal/ck_image/files/mcpe-master-coins-hack-download_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/are-robux-generators-safe_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-roblox_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-tool-v1-9-apk_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-links-2021_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-cheat_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/100-free-spins-coin-master-2021_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-link-today_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-2021_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-code-hack_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/i-need-more-free-spins-on-coin-master_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/is-there-any-way-to-get-free-robux_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-link-download-hack_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/free-coin-master-account_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-free-ios-2021_GM479516143.pdf
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-pe-free-download-android_GM479516143.pdf
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/free-multiplayer-minecraft-server_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cb1.bin
9751bcb66444ff8311face7a3a1aa37ba406c6c1f40346990607933bef6b185b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CB1 27868 bytes
font_01_sfnt_off00008da4.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA4 5696 bytes
font_02_sfnt_off00009ab6.bin
248f759c619fe1c96c576728ba71c16d7d0933fc88833f740ae7987d47f6eb68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB6 18356 bytes

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