Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3c823c8e14e406…

MALICIOUS

PDF

33.2 KB Created: 2021-07-09 14:16:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 430f8c7084f6e31b85c36050743b2206 SHA-1: 22575b26134b2fb80b28e855e9a684bef8ad98ec SHA-256: ee3c823c8e14e4068ba9171d86d10c18319228652bf56ba7bcc3739019c57614
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to other PDF files hosted on yowchang.com, suggesting a link farm or SEO manipulation tactic. The document body and extracted URLs indicate a lure for free game-related downloads and hacks, such as Minecraft and Roblox. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a malicious workflow designed to redirect users to potentially harmful content.

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/479516143/free-minecraft-addons-game-hack PDF link annotation
    • https://yowchang.com/image/data/files/pokmon-go-free-download-apk_GM1094591345.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-change-your-name-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-install-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-hack-robux-ohne-handynummer_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-robux-press-g_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/welcome-to-robloxwin-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-robux-inspect-element-no-wait_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/earn-free-robux-today_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_off00002fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA8 21652 bytes
SHA-256: d4449df28d1082c8d2ea5e8a7c448b3bf4caf58a31ec4605860ecc51fe1ce647
font_01_sfnt_off00005f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F42 18172 bytes
SHA-256: f2b502c1f7fdc586459d018faaa780361b03439c740158c4dfbe15d97db793b4

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