Malicious PDF — malware analysis report

Static analysis result for SHA-256 7946636bdee22ea4…

MALICIOUS

PDF

35.3 KB Created: 2021-07-09 05:30:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9bf1708e49c822a0c5b5d3727d693d95 SHA-1: 27190947b5a3f6ce3254751619a9d379043e7ff3 SHA-256: 7946636bdee22ea4f9f6dd793726b73621dfc3a11a573f6ef16484074cd78e97
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified as a link farm, pointing to websites offering free game currency and items. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure reinforces the malicious intent. The primary attack pattern involves directing users to external, potentially malicious, URLs.

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/free-spins-for-coin-master-game-game-hack
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-roblox-to-play-without-downloading_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/hacked-client-for-minecraft-bedrock_GM479516143.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-redeem-code-roblox_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-spins-and-coins_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-codes-no-survey-no-download-2021_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/how-to-get-free-roblox-gift-cards_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/want-free-robux-now_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-hack-2021-ios_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/robux-in_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-without-doing-anything_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/minecraft-115-2-hacks_GM479516143.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/minecraft-linux-free_GM479516143.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/how-to-get-free-shirts-on-roblox_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/earn-robux-today_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-pc_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/how-to-get-the-galaxy-hair-for-free-in-roblox_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/como-obtener-robux-usando-cheat-engine-66_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/blonde-girl-hair-free-roblox_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/roblox-promo-codes-generator-no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033c9.bin
c4d0235485802f34a4293d4223d86cbbce273b26fbe19b830b8f9dc53a09c670		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33C9 22848 bytes
font_01_sfnt_off00006701.bin
ba2b1c803cf60430fecd3a4ea667911e0c566277fb0db9da711a2662cfde09a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6701 18432 bytes

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