Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef96bdd6388434ce…

MALICIOUS

PDF

43.7 KB Created: 2021-05-16 07:08:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d9f056fa5b02333133b37ab68fe55dfd SHA-1: 7abde950e0d86610a0c64b5faeb27762a468636b SHA-256: ef96bdd6388434ce1dc644ed3ca69f75ebdfe846efce57c1d5a60e8934da60db
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are part of a link farm designed to attract users with promises of free Robux or game hacks. The heuristic 'SE_MFA_LURE' suggests the document may also attempt to harvest multi-factor authentication codes or credentials. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.xyz/app/431946152/free-robux-sites-2021-game-hack
    • https://jas8.com.tw/image/data/files/free-robux-codes-2021-not-used_GM431946152.pdf
    • https://jas8.com.tw/image/data/files/how-to-get-roebucks-on-roblox_GM431946152.pdf
    • https://jas8.com.tw/image/data/files/coin-master-free-spins-hack_GM406889139.pdf
    • https://jas8.com.tw/image/data/files/coin-master-game-2021-free-spin-link_GM406889139.pdf
    • https://jas8.com.tw/image/data/files/coin-master-mod-version-free-download-v344_GM406889139.pdf
    • https://jas8.com.tw/image/data/files/coin-master-apk-hack-358_GM406889139.pdf
    • https://jas8.com.tw/image/data/files/roblox-hack-2021_GM431946152.pdf
    • https://jas8.com.tw/image/data/files/download-coin-master-hack-tool-v1-9_GM406889139.pdf
    • https://jas8.com.tw/image/data/files/free-game-pack-with-google-play-coin-master_GM406889139.pdf
    • https://jas8.com.tw/image/data/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdf
    • https://jas8.com.tw/image/data/files/free-roblox-followers-generator-2021_GM431946152.pdf
    • https://jas8.com.tw/image/data/files/se-puede-hackear-coin-master_GM406889139.pdf
    • https://jas8.com.tw/image/data/files/free-coins-coin-master-blog_GM406889139.pdf
    • https://jas8.com.tw/image/data/files/roblox-sexually-abused_GM431946152.pdf
    • https://jas8.com.tw/image/data/files/coin-master-free-spins-link-download_GM406889139.pdf
    • https://jas8.com.tw/image/data/files/free-robux-hack-generator_GM431946152.pdf
    • https://jas8.com.tw/image/data/files/buy-robux-free_GM431946152.pdf
    • https://jas8.com.tw/image/data/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://jas8.com.tw/image/data/files/roblox-hack-apk_GM431946152.pdf
    • https://jas8.com.tw/image/data/files/coin-master-free-coins-link-facebook_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004922.bin
92613d67b7e600a6b9dc397aa5f368fc0c4dfc0d757e9e34cb7b67581b3fe852		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4922 26956 bytes
font_01_sfnt_off00008776.bin
b8260c20a5a482fa631977c1895ef4fabb59c0a91f65cf95745fb521070d0a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8776 18640 bytes

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