Malicious PDF — malware analysis report

Static analysis result for SHA-256 019556c8244f118c…

MALICIOUS

PDF

34.5 KB Created: 2021-06-29 13:23:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 53e7c042dd992a3c516841a70d7d03b3 SHA-1: 3009f8cc60dfa55ee2a4835bc18e8d809028a21e SHA-256: 019556c8244f118c09753ef392720825a7e2ffe7698c8a9c3944fc0489d9ff95
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links and a primary URL pointing to a site offering game hacks and cheats, indicating a lure for users to download potentially malicious files. The PDF_SEO_LINK_FARM heuristic firing suggests a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious payloads. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/freemobile-360.info-free-robux-game-hack PDF link annotation
    • https://resmed.ear.com.tw/image/data/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-generator-2021-nov_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-balloon-pauldrons-on-roblox_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-hack-roblox-accounts-2021-august_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-steves-one-piece-hack_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
font_00_sfnt_off00002f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4A 21888 bytes
SHA-256: 746b7d9b0947d9e2d45a18332f7f059d4e7c051cb77da4feafafb473d3446eb7
font_01_sfnt_off00005fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA8 19748 bytes
SHA-256: 846815f7c688fdabe08d6645bb212ba8eecdb2b253ebef0112aa0cbf3d2f32da

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