Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a3070ec9ce345c…

MALICIOUS

PDF

43.7 KB Created: 2021-05-11 00:24:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3913075b7b60d604b04c4664eec4cc36 SHA-1: 83d1291a2dd405ee2fea91c2cf22b89c313eda5c SHA-256: b0a3070ec9ce345cdb40a504444e336ac6c0f4347f2ecd5eb583a0fd64bb436d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a link farm, all pointing to websites offering game hacks and free in-game currency, such as 'Roblox Hacked Accounts List'. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests a deliberate effort to create a large number of links for SEO manipulation, likely to distribute malware or phishing content. The presence of a 'download button' lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/roblox-hacked-accounts-list-game-hack PDF link annotation
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-iphone_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-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_off0000464f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x464F 24012 bytes
SHA-256: 97bc104caeb0d08cd99621daf677119c1d7a3cac6ca96b29fe8e97a626b55735
font_01_sfnt_off00007cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF0 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000086b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B1 18720 bytes
SHA-256: fc7b133a6c1dcbd831a87427d92a14fbfb4bbc577a85d8c62e04ee2ff9906700

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