Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9b5febb046568a…

MALICIOUS

PDF

44.8 KB Created: 2021-05-14 06:36:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7af373194059e59b1c2e65f950923c17 SHA-1: 7a14f8102b28116dc95086a089f927cb08090fe5 SHA-256: ed9b5febb046568a7dbc60e202861a9e1df07a5031c0a853f5038e5e95423417
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, many of which are SEO-optimized and point to game-related content like 'free Robux' or 'Coin Master spins'. This suggests a link farm or a lure to a phishing site. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking malicious links.

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 https://netcdn.xyz/app/431946152/ways-to-get-free-robux-2021-game-hack
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-for-free_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/microsoft-roblox_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/earn-free-robux-today_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-as-a-kid_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/how-can-i-get-minecraft-for-free_GM479516143.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/roblox-hacks-and-cheats_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/free-spin-coin-master-instagram_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/free-redeem-code-for-coin-master_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/install-coin-master_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/oprewards-com-earn_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/coin-master-hacks_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/how-to-get-2021-robux-for-free_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/hack-coin-master-without-verification_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/real-hack-for-coin-master_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/coin-master-hack-app-android-download_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-apk-download_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/free-roblox-pin-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c28.bin
98fa53bb8cf3e8285e9e0e640fcdf43a7fb00f525a26ee3d9f2c6c48060518fd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C28 27304 bytes
font_01_sfnt_off00008a19.bin
23f4c6d0bfdce0b55b29b4c4e1f8fc5f357783b93db13de52c4fadcc57c1eadd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A19 19128 bytes

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