Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac85b2ab5dbca745…

MALICIOUS

PDF

45.2 KB Created: 2021-05-11 03:20:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 12adbdaf42d0d1221df4db8c62fa8687 SHA-1: 51f7da6865fa09a50d37cb818ab6c0501b82fc37 SHA-256: ac85b2ab5dbca7458af79a3d98d97ca4eb4880b23a0535d52d6a902d450edd58
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which appear to be SEO-driven, pointing to various gaming-related content. One prominent link, 'https://netcdn.xyz/app/406889139/free-spin-and-daily-news-coin-master-game-hack', suggests a lure for game cheats or hacks. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and numerous embedded links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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.xyz/app/406889139/free-spin-and-daily-news-coin-master-game-hack
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/games-for-robux_GM431946152.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/how-do-you-get-free-robux_GM431946152.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-free-attack_GM406889139.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/daily-coin-master_GM406889139.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/how-to-download-minecraft-hacks_GM479516143.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-apk-mod-coin-master_GM406889139.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/how-to-hack-coin-master-with-game-guardian_GM406889139.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-hacks-for-gold-cards_GM406889139.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-robux-no-offers_GM431946152.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/easy-robux_GM431946152.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/how-to-get-free-roblox-premium_GM431946152.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/roblox-hack-codes_GM431946152.pdf
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-cheat-codes-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049d4.bin
9ce4ef50ee1eef2ea1a88d1a66ea43f1d14147001c302fbc3214118ebca94365		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D4 24676 bytes
font_01_sfnt_off000082e3.bin
6a728a9066ba65435d6380d78d87d8ee4d5553deba8217e5dee5b64eeb83287d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E3 2932 bytes
font_02_sfnt_off00008d0a.bin
1b97510549e3d8fe11dfd7453b1479af326f6ce77077d5a4dbd4033950bc4681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0A 18648 bytes

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