Malicious PDF — malware analysis report

Static analysis result for SHA-256 71671e7fe76c4250…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 22:21:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6241df59f51e4630987406b6af64cbae SHA-1: ca9811ce9ac7369d0f821e69faf837f0069f0b5b SHA-256: 71671e7fe76c425054b23fdc6f10fe62c4b3438b4fe585324a1d4c922ffed00c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a document body referencing game hacks and cheats, indicating a lure for users to download potentially malicious content or visit phishing sites. The PDF_SEO_LINK_FARM heuristic firing suggests a large number of external links were generated, likely for SEO manipulation or to distribute malware. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of this 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.tw/app/406889139/coin-master-free-spin-now-game-hack PDF link annotation
    • https://yeushuen.com.tw/image/data/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/corn-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-executor-free_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/cool-free-outfits-roblox_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-hack-jailbreak-roblox-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-online-roblox-play_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/como-tener-dinero-infinito-roblox-high-school-hack_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-create-a-free-admin-game-in-roblox_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-do-i-hack-roblox-accounts_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_off00002f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F41 23216 bytes
SHA-256: 119a49de4b4c77a5803b037d6c144cd3238336b5bf07a2c3046983a9c040f82a
font_01_sfnt_off000063a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A1 18336 bytes
SHA-256: 6b20469be8faec5c8c7f2170c7fbb481140104050cd6a6398e6de2d19d913737

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