Malicious PDF — malware analysis report

Static analysis result for SHA-256 09426bb436c87a3c…

MALICIOUS

PDF

35.5 KB Created: 2021-06-29 15:35:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2416966a533fd06e3e1fff28eb1c7c7f SHA-1: 242413d2b158a3111f59d846f165895aa6bc6d6b SHA-256: 09426bb436c87a3c232834337f293afb73fede809fdfddf3aa5b1eaa3067faeb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are related to 'free Robux' or 'Coin Master free spins', suggesting a scam or lure for potentially unwanted applications. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a 'download button' heuristic further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/free-robux-app-play-games-earn-robux-game-hack PDF link annotation
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/get-free-tiktok-followers-no-verification_GM835599320.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-robux-2021-june_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-get-free-pet-in-billionaire-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/roblox-promocode-hack-2021-pastebin_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/flobfun-robux-gnrateur-free-robux_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/roblox-twister-murder-how-to-hack-credits_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/can-you-get-roblox-for-free-on-xbox-360_GM431946152.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
font_00_sfnt_off000031ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AE 22616 bytes
SHA-256: 3cc4afa803f59d8c82a6ac17810d664636e2a563c6182710f5439f9f478bd931
font_01_sfnt_off00006459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6459 19560 bytes
SHA-256: 31dbd3f376a4bbdfd8440e1dc8faeeb304c742796a2c662dfac3ba2a879d1cd9

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