Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4288358374cef49…

MALICIOUS

PDF

34.5 KB Created: 2021-06-29 13:18:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 81b605a85e32b82c8c0cb1f0970618c3 SHA-1: d2df313ce406853f04b3f62657126cc8a8c370d8 SHA-256: f4288358374cef491d212407313ec49bf4be6af58116a69d580d74c93ddf7ac2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of embedded links to external PDF files, many of which are related to game cheats and hacks. The primary URL, http://netcdn.co/app/431946152/how-to-cheat-in-roblox-eep-city-starball-game-hack, suggests a lure for users seeking exploits. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent behind the link farm.

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.co/app/431946152/how-to-cheat-in-roblox-eep-city-starball-game-hack
    • https://purihostel.com/assets/CKImages/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/how-to-get-free-spins-grom-coin-master_GM406889139.pdf
    • https://purihostel.com/assets/CKImages/files/minecraft-115-2-hacks_GM479516143.pdf
    • https://purihostel.com/assets/CKImages/files/coin-master-hack-tool-download_GM406889139.pdf
    • https://purihostel.com/assets/CKImages/files/free-roblox-lightroom-cinema-4d_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/how-to-get-free-robux-on-iphone_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/project-evolved-roblox-cheats_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/spin-link-coin-master_GM406889139.pdf
    • https://purihostel.com/assets/CKImages/files/huskybuckscom-free-robux_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/coin-master-free-blogspot_GM406889139.pdf
    • https://purihostel.com/assets/CKImages/files/how-to-get-free-robux-on-roblox-2021-no-hacks_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/how-to-hack-roblox-model-not-for-sealf_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/roblox-phantom-forces-hack-reddit_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/how-to-get-roblox-premium-for-free_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/how-to-find-free-servers-on-roblox_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/roblox-how-to-speed-hack-2021_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/free-robux-codes-without-human-verification_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/how-to-get-free-coins-on-roblox_GM431946152.pdf
    • https://purihostel.com/assets/CKImages/files/coin-master-hack-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003189.bin
df824e87126e7e5b68248a31721b382bc6586a744a25ccbe65adcfed54c7dcc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x3189 21516 bytes
font_01_sfnt_off00006091.bin
497d7d6e8380f4df05f828fb06919d322def7f70feaafee57fecf0de388d5f75
pdf-font-stream PDF embedded font (sfnt) at offset 0x6091 19396 bytes