Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa823204e6376949…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 09:51:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fc0f6f9608aa26b19ebfa8e5e7f06286 SHA-1: d2c11f5038b43afcfe59b8f4287d6bc2e13b20c3 SHA-256: aa823204e6376949de826c1825e4ef4392010664e2c47afe54512489fa5d9237
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to manipulate search engine results or direct users to potentially malicious content. The document body and extracted URLs also indicate a lure related to game hacks and free in-game currency, which is a common theme in phishing and scam campaigns. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/how-to-coin-master-hack-game-hack
    • https://www.modestuae.com/uploaded_files/userfiles/files/free-black-t-shirt-roblox_GM431946152.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/free-robux-websites-that-work_GM431946152.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/promo-codes-to-get-free-robux_GM431946152.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/free-private-minecraft-server_GM479516143.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/get-coin-master-cards-free_GM406889139.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/how-can-i-get-robux_GM431946152.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/get-more-free-spins-on-coin-master_GM406889139.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/collect-free-spin-linms-coin-master_GM406889139.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/free-spins-from-coin-master_GM406889139.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/coin-master-free-spins-gratis_GM406889139.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/roblox-mobile-hack_GM431946152.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/coin-master-hack-apk-download-for-android_GM406889139.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/coin-master-game_GM406889139.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/coin-master-online-hack-link_GM406889139.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/best-free-robux-sites_GM431946152.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/minecraft-name-tag-hacks_GM479516143.pdf
    • https://www.modestuae.com/uploaded_files/userfiles/files/minecraft-survival-hacks_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005059.bin
d5c48dbea5b1d29a92a8f099523c3924d8c6230564e5260ea632540beef1c127		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5059 26184 bytes
font_01_sfnt_off00008b87.bin
b097c0e0a508b19b294d84254edc3a7906d96ed82e768bd7a04e405a1f825274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B87 17880 bytes

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