Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d546d0a1d086611…

MALICIOUS

PDF

33.8 KB Created: 2021-07-07 14:03:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ca0a92d361a44797abf31c3825f254ac SHA-1: 5d1af98469d22d44e1d494bb0afda2bc445ddbb4 SHA-256: 8d546d0a1d0866113c031f6d0102395ac02a2716d67ad187ad615548b5937517
102 Risk Score

Malware Insights

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

This PDF document contains numerous links to external resources, many of which are presented as game hacks or cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a tactic to drive traffic to potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. The primary IOC is the URL http://netcdn.tw/app/431946152/robux-2021-game-hack, which is likely the intended download destination.

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.tw/app/431946152/robux-2021-game-hack PDF link annotation
    • https://xiangquan.com.tw/image/data/files/legends-of-speed-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-hack-the-chat-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-do-people-make-roblox-hack-tools_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/kill-hack-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F01 22076 bytes
SHA-256: ca878611ec9b5324689c1cedccfb6ad8e11957d6401240f7553c03529ff06de8
font_01_sfnt_off00005f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F30 18956 bytes
SHA-256: 03f490474d7ca969cd9c035121b9b885a49cfdd7fa0568d5688fc6c6f9ec8423

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