Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c339a9c1c98d18c…

MALICIOUS

PDF

42.6 KB Created: 2021-05-13 21:23:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fe4782e5715b4d7ca2ca8ed00a393d7f SHA-1: 094a9e3ab73240ac9abed6082f5dcbe993a8db02 SHA-256: 7c339a9c1c98d18c3b5f40afbe80db58c24bc1d5f6111165f87384eb2e652fd6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to attract users searching for game hacks. The primary URL, https://netcdn.xyz/app/406889139/smart-lodhi-coin-master-hack-game-hack, is likely the intended destination for downloading a malicious payload. The ML classifier strongly indicated maliciousness, supporting the observed link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/smart-lodhi-coin-master-hack-game-hack
    • http://mou16-murmansk.ru/images/coin-master-free-spins-hack-iphone_GM406889139.pdf
    • http://mou16-murmansk.ru/images/coin-master-free-coin-hack_GM406889139.pdf
    • http://mou16-murmansk.ru/images/coin-game_GM406889139.pdf
    • http://mou16-murmansk.ru/images/free-robux-without-downloading-anything_GM431946152.pdf
    • http://mou16-murmansk.ru/images/i-got-hacked-on-roblox_GM431946152.pdf
    • http://mou16-murmansk.ru/images/coin-master-free-spins-youthnow_GM406889139.pdf
    • http://mou16-murmansk.ru/images/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdf
    • http://mou16-murmansk.ru/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • http://mou16-murmansk.ru/images/free-robux-no-verification-at-all_GM431946152.pdf
    • http://mou16-murmansk.ru/images/hack-coin-master-android-2021_GM406889139.pdf
    • http://mou16-murmansk.ru/images/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdf
    • http://mou16-murmansk.ru/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdf
    • http://mou16-murmansk.ru/images/free-robux-without-human-verification_GM431946152.pdf
    • http://mou16-murmansk.ru/images/all-links-for-free-spins-coin-master_GM406889139.pdf
    • http://mou16-murmansk.ru/images/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://mou16-murmansk.ru/images/coin-master-daily-free-spins-blogspot_GM406889139.pdf
    • http://mou16-murmansk.ru/images/roblox-apocalypse-rising-hack_GM431946152.pdf
    • http://mou16-murmansk.ru/images/free-unlimited-robux_GM431946152.pdf
    • http://mou16-murmansk.ru/images/no-human-verification_GM431946152.pdf
    • http://mou16-murmansk.ru/images/get-free-robux-no-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b23.bin
5ec9757728953e5d63ad3f572ed20d38976542fbc6e31c267fdc66be69c36fc0
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B23 25064 bytes
font_01_sfnt_off00008427.bin
a05114009afcd09b57a1cbd8077165af15d86336b6d5abd27516af736212cac5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8427 18316 bytes