Malicious PDF — malware analysis report

Static analysis result for SHA-256 252f9973c20970c2…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 23:23:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ea8fc85618e8a2b00f69cb329f5efdea SHA-1: fea23cde70dd477dc6ee9d48f30d00bbfff9fe0e SHA-256: 252f9973c20970c2012752562e5ee69d382dd6d5f94f4b145bbbd2fd072fdbe7
102 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as SEO link farms for game hacks and cheats. The ML classifier also flagged this PDF as malicious. The presence of a call-to-action phrase suggests an attempt to trick users into clicking these links, likely leading to malware downloads or further phishing attempts.

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/406889139/fbchampion-game-hack
    • http://www.nfca.org.tw/upload/files/guuudinfo-robux-hack-no-persinal-infomation_GM431946152.pdf
    • http://www.nfca.org.tw/upload/files/how-to-get-1-million-free-robux-breast-milk_GM431946152.pdf
    • http://www.nfca.org.tw/upload/files/get-free-group-roblox_GM431946152.pdf
    • http://www.nfca.org.tw/upload/files/top-free-rthro-on-roblox_GM431946152.pdf
    • http://www.nfca.org.tw/upload/files/free-robux-no-verification-at-all_GM431946152.pdf
    • http://www.nfca.org.tw/upload/files/coin-master-hack-apk-iphone_GM406889139.pdf
    • http://www.nfca.org.tw/upload/files/coin-master-hacks-for-free-spins_GM406889139.pdf
    • http://www.nfca.org.tw/upload/files/coin-master-free-2021_GM406889139.pdf
    • http://www.nfca.org.tw/upload/files/broly-simulator-cheats-roblox_GM431946152.pdf
    • http://www.nfca.org.tw/upload/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • http://www.nfca.org.tw/upload/files/free-links-for-coin-master_GM406889139.pdf
    • http://www.nfca.org.tw/upload/files/roblox-hack-robux-gratis-2021_GM431946152.pdf
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux-for-kids_GM431946152.pdf
    • http://www.nfca.org.tw/upload/files/master-free-spin_GM406889139.pdf
    • http://www.nfca.org.tw/upload/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdf
    • http://www.nfca.org.tw/upload/files/how-hack-roblox-accounts_GM431946152.pdf
    • http://www.nfca.org.tw/upload/files/coin-master-20-free-spins-link-today_GM406889139.pdf
    • http://www.nfca.org.tw/upload/files/get-free-spins-in-coin-master_GM406889139.pdf
    • http://www.nfca.org.tw/upload/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://www.nfca.org.tw/upload/files/roblox-how-to-use-cheat-engine-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002e5a.bin
5f588e11f1f92714ee0e8415688f2ef27ee5938bcf8ea67803011033eda4b520
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E5A 22632 bytes
font_01_sfnt_off000060f4.bin
fb679c9250522cab0344be15c9898f12ed930a7de6dfe2591d59bad5f2ca43f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x60F4 18656 bytes