Malicious PDF — malware analysis report

Static analysis result for SHA-256 335de4cb7b640446…

MALICIOUS

PDF

42.5 KB Created: 2021-05-12 05:32:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2f28b170c5d5853121d262051debae13 SHA-1: d9560c04d54b70fcda60343b75b82f46b83f807e SHA-256: 335de4cb7b6404467643bfd7747970b5a162e35133ab16773120b68f25ed63a3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs and a link farm, strongly suggesting it is designed to redirect users to external sites. The content, including the document body and extracted URLs, focuses on game cheats and hacks, indicating a social engineering lure. The ML classifier and PDF link farm heuristics further support the malicious classification.

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/431946152/roblox-robux-hack-game-hack
    • http://eurosystemssrl.it/images/how-to-get-free-shields-on-coin-master_GM406889139.pdf
    • http://eurosystemssrl.it/images/how-do-you-get-roblox-for-free_GM431946152.pdf
    • http://eurosystemssrl.it/images/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdf
    • http://eurosystemssrl.it/images/free-apk-mods-coin-master_GM406889139.pdf
    • http://eurosystemssrl.it/images/free-robux-stream_GM431946152.pdf
    • http://eurosystemssrl.it/images/get-free-robux-com_GM431946152.pdf
    • http://eurosystemssrl.it/images/legit-coin-master-hack-without-verification_GM406889139.pdf
    • http://eurosystemssrl.it/images/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://eurosystemssrl.it/images/how-to-get-java-minecraft-free_GM479516143.pdf
    • http://eurosystemssrl.it/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://eurosystemssrl.it/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • http://eurosystemssrl.it/images/coin-master-hack-online-without-human-verification_GM406889139.pdf
    • http://eurosystemssrl.it/images/coin-master-free-spins-link-october-2021_GM406889139.pdf
    • http://eurosystemssrl.it/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://eurosystemssrl.it/images/coin-master-online-hack-tool_GM406889139.pdf
    • http://eurosystemssrl.it/images/coin-master-hack-game_GM406889139.pdf
    • http://eurosystemssrl.it/images/best-minecraft-hacked-client_GM479516143.pdf
    • http://eurosystemssrl.it/images/coin-master-free-coins-link-2021_GM406889139.pdf
    • http://eurosystemssrl.it/images/free-coin-master-gifts_GM406889139.pdf
    • http://eurosystemssrl.it/images/coin-master-free-spins-2021-app_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047df.bin
5eb07865c076168b493750c9ad34cd1f29c1973c30da9321fc84d0c39f42bfb8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47DF 26244 bytes
font_01_sfnt_off00008389.bin
fa424f86a9ddd472d540fc30f07119be4b576a9306b5f7bb82c207f2bb92a2b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8389 18320 bytes

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