Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fd4dcfd62e7d0b…

MALICIOUS

PDF

44.5 KB Created: 2021-05-19 19:03:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d464f14017ec30cc5ca5aa98b4a97ce7 SHA-1: 28683f99cd2161421dff5f6583f83f75eb326ba6 SHA-256: 25fd4dcfd62e7d0b44420767bcd73a4e81579fe1aac3b7cd0d1e0e112c55a22f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are related to game hacks and cheats, suggesting a lure to download malware. The presence of an MFA lure indicates a potential credential harvesting attempt. The ML classifier strongly flagged this PDF as malicious, and the embedded links point to suspicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/1330123889/pubg-hack-uc-20219-game-hack
    • http://xn--80aciiv6azczc.xn--p1ai/images/roblox-inappropriate_GM431946152.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-hack-app-2021-download_GM406889139.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-free-spins-and-chips_GM406889139.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-free-spin-and-trading-group_GM406889139.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/funbloxxyz-free-robux_GM431946152.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/mcmaster-club-coin-master-hack_GM406889139.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-hack-coin-master_GM406889139.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/get-free-robux-now_GM431946152.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-rewards-2021_GM406889139.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/robux-free-com_GM431946152.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-hack-apk-no-fb-login_GM406889139.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-roblox-gift-card_GM431946152.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-get-free-roblox_GM431946152.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/cool-free-minecraft-skins_GM479516143.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-get-roblox-premium-for-free_GM431946152.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-robux-generator-without-human-verification_GM431946152.pdf
    • http://xn--80aciiv6azczc.xn--p1ai/images/minecraft-java-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000045f3.bin
626d29c044f56f661d7fa0def8fe723e11b4b8d73a12b93b6ce8c0fd59884910		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45F3 29228 bytes
font_01_sfnt_off000089e3.bin
d69e841c4c8a5f01befa6629bdb28ec39a8be84ee0cdaac8a2e502fde0dbcc90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E3 18864 bytes

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