Malicious PDF — malware analysis report

Static analysis result for SHA-256 54eb4aa09101d64c…

MALICIOUS

PDF

43.6 KB Created: 2021-05-16 01:20:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c2d868e40d15a360bcc18ca98e07de85 SHA-1: f9bb09473bb22acc94a685c10885af9b900048ad SHA-256: 54eb4aa09101d64c1825f1977f8d009cfb02153892af5436c8b8aa1a5526c71c
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm, suggesting a tactic to drive traffic to potentially malicious sites. The document body and extracted URLs indicate a lure for users seeking hacks or free in-game currency, likely leading to malware downloads or scams. The ML classifier strongly flagged this PDF as malicious.

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/406889139/coin-master-spin-hack-apk-game-hack
    • https://xiangquan.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/robux-generator-2021_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/coin-master-free-gold-cards-link_GM406889139.pdf
    • https://xiangquan.com.tw/image/data/files/coin-master-spin-pattern_GM406889139.pdf
    • https://xiangquan.com.tw/image/data/files/how-do-we-get-free-robux_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/coin-master-get-free-cards_GM406889139.pdf
    • https://xiangquan.com.tw/image/data/files/free-roblox-codes-2021_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/coin-master-free-400-spin-link_GM406889139.pdf
    • https://xiangquan.com.tw/image/data/files/real-free-robux-generator_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/mobihack-roblox-hack_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/how-to-earn-free-robux_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/minecraft-the-complete-handbook-collection_GM479516143.pdf
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdf
    • https://xiangquan.com.tw/image/data/files/how-to-hack-people-on-roblox_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/free-roblox-cards-pin-number_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/coin-master-daily-free-spins-25_GM406889139.pdf
    • https://xiangquan.com.tw/image/data/files/free-ways-to-get-robux_GM431946152.pdf
    • https://xiangquan.com.tw/image/data/files/can-you-download-minecraft-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000495a.bin
6bc29ddb8260df6292aeba2761b18c212af2ea4806fa3ed36a57ae15b56d2a31		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x495A 24036 bytes
font_01_sfnt_off00007f47.bin
381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F47 2824 bytes
font_02_sfnt_off000088e9.bin
f240daff11927ead54175dd0584966adfe4c567a63bac043ed3985d3f12dfc21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E9 17892 bytes

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