Malicious PDF — malware analysis report

Static analysis result for SHA-256 401b65bce546d9a8…

MALICIOUS

PDF

44.4 KB Created: 2021-06-11 04:23:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7fd6f5174c1c9709270c123b532d767b SHA-1: a377e65bd4e22ee923331cdeb1c3627be6cf2899 SHA-256: 401b65bce546d9a8004d6897077120f33bedf7d8d3ea03410e908ef566feae71
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links. The document body, though corrupted, suggests a lure related to 'Hack Roblox Gift Card Codes'. The presence of external URIs and the ML classifier's high confidence score point towards a malicious intent to redirect users to potentially harmful websites. No scripts were extracted from this sample, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/hack-roblox-gift-card-codes-game-hack
    • https://healthcare.kyst.com.tw/image/data/files/games-to-get-free-robux_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-coins-on-tiktok_GM835599320.pdf
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-by-watching-ads_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/roblox-hack-unlimited-robux_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/pasos-para-hackear-coins-master_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-home_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hack-mod-apk-2021_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/how-to-hack-any-roblox-account_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/how-to-actually-get-free-robux_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/roblox-hack-me-robux_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/roblox-gang_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/easy-robux-hack_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/blogspot-free-spins-coin-master_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-websites-2021_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/optifine-pe_GM479516143.pdf
    • https://healthcare.kyst.com.tw/image/data/files/robux-gift-card-free_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hack-software-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005118.bin
4ac3b825ee8b734dd7afce78b920be965db0b914b46c6d96c610d1125a4796fc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5118 24720 bytes
font_01_sfnt_off000089d1.bin
2836f90637e08e6730b07b64095127ca24c2a7afbd5a2846d0f2d25e55123b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D1 18580 bytes

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