Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9bc5b55d8e509b…

MALICIOUS

PDF

45.4 KB Created: 2021-06-09 08:38:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c64cb834f6d987b8181327c657d114a9 SHA-1: bd9c9f0a669c59bff0a6eeeedf6efe985a81929a SHA-256: 1c9bc5b55d8e509b1ca90a3dfbd2a2494b1dfbccac67fa84d77d73ce0fd1e072
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links and a link farm heuristic, indicating a likely SEO spam or content distribution campaign. The document body and extracted URLs suggest a lure related to free game currency or accounts, a common tactic for phishing or malware distribution. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/free-roblox-accounts-with-1-million-robux-game-hack PDF link annotation
    • https://wenshan.com.tw/upload/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/roblox-verification_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-roblox_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-no-anti-bot-verification_GM431946152.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_004_off0000501a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501A 27200 bytes
SHA-256: 887b35096a55109020be690f116e7676da55c0f2a7be0647bec7db55c8fb8b5f
font_01_sfnt_off00008d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D15 18980 bytes
SHA-256: c68efa0a38052ee10103535acc3bd181257e2d0ecdfca200a365e7270494ad41

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