Malicious PDF — malware analysis report

Static analysis result for SHA-256 551f47829f5a851f…

MALICIOUS

PDF

45.9 KB Created: 2021-06-08 18:10:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8e662369b971b9df864a5354f6489658 SHA-1: aa39f478ec00e5269a972d3eeb4a426f21ddabfe SHA-256: 551f47829f5a851f9fa2da74a1775fb05fe1696ae7659cbc5f3863a87a066d22
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many of which point to other PDF files hosted on easypay.af. These linked PDFs appear to be lures for game hacks and cheats, suggesting a phishing or scam campaign. The ML classifier also flagged this document as malicious with high confidence. The document's primary function is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-free-account-maker-game-hack
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-hack-tool-ios_GM406889139.pdf
    • https://easypay.af/uploaded_files/userfiles/files/hack-coin-master-for-android_GM406889139.pdf
    • https://easypay.af/uploaded_files/userfiles/files/free-robux-no-survey-or-human-verification_GM431946152.pdf
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-online-hack-generator_GM406889139.pdf
    • https://easypay.af/uploaded_files/userfiles/files/no-human-verification_GM431946152.pdf
    • https://easypay.af/uploaded_files/userfiles/files/free-coins-and-spins-in-coin-master_GM406889139.pdf
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdf
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdf
    • https://easypay.af/uploaded_files/userfiles/files/no-scam-free-robux_GM431946152.pdf
    • https://easypay.af/uploaded_files/userfiles/files/free-roblox-hair-boy_GM431946152.pdf
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdf
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdf
    • https://easypay.af/uploaded_files/userfiles/files/get-free-spins-coin-master-link_GM406889139.pdf
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • https://easypay.af/uploaded_files/userfiles/files/get-free-robux-gg_GM431946152.pdf
    • https://easypay.af/uploaded_files/userfiles/files/inappropriate-roblox-games-2021_GM431946152.pdf
    • https://easypay.af/uploaded_files/userfiles/files/free-robux-download_GM431946152.pdf
    • https://easypay.af/uploaded_files/userfiles/files/roblox-hack-download_GM431946152.pdf
    • https://easypay.af/uploaded_files/userfiles/files/roblox-com-free-robux_GM431946152.pdf
    • https://easypay.af/uploaded_files/userfiles/files/roblox-robux-codes-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005148.bin
ab9f1000357847c6bacc27fc2335b55fe3c5f418ed3f0d0b5278f5cdacde0826
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5148 27084 bytes
font_01_sfnt_off00008f7c.bin
96343d95b2ef7a984288984cabc0d40b5a85f9b11f8ff44da3e23c1c8e9185b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7C 18788 bytes