Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ab0f8d5bc9b2cc…

MALICIOUS

PDF

35.4 KB Created: 2021-06-27 10:51:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 016524fa81d17f259e58416162560a5e SHA-1: 6a104fa4865cc9c3b00ebc386c0aa5658a6f022e SHA-256: 59ab0f8d5bc9b2cc1dc7c6dfebb46e324c168389ff1b75fcbf2d485b7c09a57b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are SEO-optimized and point to external resources related to free items, hacks, and spins for popular games. The ML classifier and PDF link farm heuristics strongly indicate malicious intent, likely to direct users to phishing or malware download sites. The presence of a download button lure further supports this. No scripts were extracted, but the extensive link farm suggests a phishing or content-luring attack pattern.

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/roblox-all-free-items-2021-userscript-game-hack PDF link annotation
    • https://www.ruchya.com.tw/upload/files/coin-master-home_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-no-downloads-and-no-email-all-free_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-stuff-on-roblox-catalog-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-look-cute-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-super-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-2021-august_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/medieval-warfare-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/the-best-free-roblox-shirt_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-game-2021-free-spin-link_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
font_00_sfnt_off00003153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3153 22484 bytes
SHA-256: e8434e7f1add23be1264dc13503826ed4397f246b20ab68ec7c288f8112020d1
font_01_sfnt_off00006371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6371 19712 bytes
SHA-256: 60e076cc4dae52e642ebc28ba507ac9c0867337018db900dda8faa20afb3d5a1

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