Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfda3456ac3269cf…

MALICIOUS

PDF

35.9 KB Created: 2021-06-27 00:26:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e5300b4bb58a93af03f670f77ddc464b SHA-1: 8430ec7b7b972680953a63d38dba97c8424ec54e SHA-256: bfda3456ac3269cf89841b1c5ffcd6b5b37542494aad8ad456ae9a3aa15e38d4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to "free Robux" and embeds a large number of external links, many of which point to other PDF files. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or SEO poisoning tactic. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a download button lure further supports a malicious intent to redirect users to potentially harmful content.

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 http://netcdn.co/app/431946152/how-to-get-free-robux-nicsterv-game-hack PDF link annotation
    • https://opac.heritagejkt.org//repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/where-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-roblox-mod-menus_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-mm2-hack-knives-script_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/grabpoints-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003265.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3265 23324 bytes
SHA-256: 8d29cad4363ea65da76501db7852ded6992e7f416dbf34827155118f28886fa6
font_01_sfnt_off000066ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EE 19220 bytes
SHA-256: ebacacbc43f13efb7c0915d912883b8b5fdea01a6be8a1f4f7be5d1ef0d252ff

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