Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b70ba051dc5734…

MALICIOUS

PDF

38.8 KB Created: 2021-07-03 20:36:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 80ea1de226eacc1448b28ddaf605aa8f SHA-1: 75d69142982b1ab8f1f505dc51add720c2e3f744 SHA-256: 51b70ba051dc573453574af6ce5082ddf465da7b7a2e95cae13990e105c3d84c
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO link farms for popular games like Roblox and Coin Master. The primary URL http://netcdn.tw/app/431946152/lots-of-robux-game-hack likely serves as a download host for a secondary payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/431946152/lots-of-robux-game-hack
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-accessories-roblox_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-spins-coin-master-october-17-2021_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/coin-master-free-gold-cards-link-2021_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/roblox-free-800-robux_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-coins-coin-master-blog_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-to-get-free-robux-website_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-to-get-free-robux-safely-on-an-ipad-lenovo_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/download-free-robux-laptop_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-spins-and-coins-coin-master-links_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-to-get-free-clothes-on-roblox-2021-without-bc_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-coins-coin-master_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/roblox-hack-to-get-free-robux-2021_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/best-roblox-exploits-free_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-robux-codes-generator-no-verification_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-roblox-promo-codes-for-robux-2021_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-admin-roblox-uncopylocked_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-spin-hack-coin-master-2021_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-minecraft-addons_GM479516143.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-roblox-accounts-2021_GM431946152.pdf
    • https://www.roblox.com/.I
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003f33.bin
a2702c34c5138f11dbaf97810a6576653f02189a1b8771dc4d00b09c7374b5bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F33 23428 bytes
font_01_sfnt_off000073e3.bin
a4ea5988f9a4bfb02c938a19077db93e73111135e2d6ed68cabd9fb167a683f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E3 18656 bytes

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