Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b50b014e67f701…

MALICIOUS

PDF

42.9 KB Created: 2021-05-12 12:37:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e1f646f0e671e3fe5b2c30fd3ec4d1a6 SHA-1: fe5876f1a2c27bc383bf5179c9b34bd447d18a65 SHA-256: 87b50b014e67f701d8482227d9aba6e22201b51f324c4507e6f0b80be534d116
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files. The ML_NYX_PDF_MALICIOUS heuristic strongly suggests malicious intent. The document body and embedded links promote free codes and hacks for games like Coin Master and Roblox, indicating a lure for potentially unwanted or malicious content. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/free-google-play-promo-codes-coin-master-game-hack
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/robux-premium_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/minecraft-redeem-code-free-2021_GM479516143.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-free-spins-link_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/minecraft-pe-server-hosting-free_GM479516143.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-minecraft-mods-for-xbox-one_GM479516143.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-hack-2021-no-human-verification_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/roblox-hacked-version_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-spin-coin-master-twitter_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/hackear-juego-coin-master-espaol_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/smart-lodhi-coin-master-hack_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/google-coin-master-free-spins_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-roblox-hair-girl_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-spin-hack-coin-master-2021_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-cracked-apk-free-download_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-robux-mod_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b62.bin
96e5a217e4f3a03192f3a04cf981db2eaf4964818a6f583df55c2bacd3e43b9a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B62 24540 bytes
font_01_sfnt_off00008397.bin
390da4ab381e5da0f3a1dba4b04518bf56609a6cb8a6a234a2d345ffc47ec2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8397 18840 bytes

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