Malicious PDF — malware analysis report

Static analysis result for SHA-256 c070b3d6af28c6f2…

MALICIOUS

PDF

48.0 KB Created: 2021-05-19 07:50:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5b1adc5dcaae09044b4e61aa1d02efc1 SHA-1: 6bdd5eb8efd6a28ee0d108f24a6cda78cde56456 SHA-256: c070b3d6af28c6f25854edd1ee444e310f3c5d8e21e54cb1425aafd7ffb35a28
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links that form a link farm, directing users to websites that promise free in-game currency or accounts. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a deceptive intent. No scripts were extracted, but the primary attack pattern is the distribution of scam links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/games-that-give-free-robux-game-hack PDF link annotation
    • https://lib-stie.yai.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46D3 29392 bytes
SHA-256: 573ef649d78fd87c11162fb0ce6b1e418187f683ba286c8679bc8fd1f029d615
font_01_sfnt_off00008a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A11 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9722 19004 bytes
SHA-256: 2c8b49b77d2c215152c292f7884bc67c80baba545cc8313e1cf14c5f8a523509

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