Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e28a60e266edf8…

MALICIOUS

PDF

34.9 KB Created: 2021-07-09 08:39:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e61ec6f5c9d1a8c7148da06c341e7fff SHA-1: ea9d92f5e55a930fbd15b7c4bcbb8fd6909d8e8d SHA-256: 57e28a60e266edf87a0b926454c7fc8a9b99d521a879c72ab55059c2083a6a7e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs and a document body that promises free in-game currency, indicating a phishing or scam attempt. The presence of a large number of external links, many of which are SEO-optimized PDF files, suggests a link farm designed to distribute malicious content or lead users to scam websites. The ML classifier also strongly flagged this PDF as malicious.

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/431946152/free-robux-no-human-verification-or-survey-2021-game-hack
    • https://miraller.com/upload/files/free-coins-on-coin-master-without-verification_GM406889139.pdf
    • https://miraller.com/upload/files/roblox-games-com-free_GM431946152.pdf
    • https://miraller.com/upload/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdf
    • https://miraller.com/upload/files/how-to-hack-2021-acc-roblox_GM431946152.pdf
    • https://miraller.com/upload/files/free-robux-websites-that-actually-work_GM431946152.pdf
    • https://miraller.com/upload/files/roblox-bloxburg-free_GM431946152.pdf
    • https://miraller.com/upload/files/coin-master-free-spins-link-download-for-iphone_GM406889139.pdf
    • https://miraller.com/upload/files/how-to-get-things-for-free-on-roblox_GM431946152.pdf
    • https://miraller.com/upload/files/coin-master-free-cards_GM406889139.pdf
    • https://miraller.com/upload/files/coin-master-free-spins-facebook_GM406889139.pdf
    • https://miraller.com/upload/files/how-to-get-free-robux-html_GM431946152.pdf
    • https://miraller.com/upload/files/minecraft-dungeons-free_GM479516143.pdf
    • https://miraller.com/upload/files/free-coins-coin-master-ios_GM406889139.pdf
    • https://miraller.com/upload/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • https://miraller.com/upload/files/how-to-get-free-robux_GM431946152.pdf
    • https://miraller.com/upload/files/free-minecraft-alt-generator_GM479516143.pdf
    • https://miraller.com/upload/files/how-do-i-change-my-roblox-username-for-free_GM431946152.pdf
    • https://miraller.com/upload/files/robux-hack-2021_GM431946152.pdf
    • https://miraller.com/upload/files/how-to-hack-on-roblox-adopt-me_GM431946152.pdf
    • https://miraller.com/upload/files/free-roblox-shirt-templates_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ffa.bin
096b5d17314226bfc23b012403c4223faeec2c417c606520fad6671372136cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFA 21940 bytes
font_01_sfnt_off00006091.bin
a686843967d16d630a3d792aecd0df7810ef9440d33d67b3fe7886ce86e787de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6091 20028 bytes