Malicious PDF — malware analysis report

Static analysis result for SHA-256 850558cc9d794642…

MALICIOUS

PDF

34.3 KB Created: 2021-06-29 20:22:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 16ee97c462d1477965cd2e6c0c119f24 SHA-1: 1475e1bc07e1c29dee8560e91f81af86f3d6f3cb SHA-256: 850558cc9d7946424f7b62e90c942700a81678c70427c94b3ac7f44e234cc24a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are structured as PDF files with titles related to free in-game currency or hacks for popular games like Roblox and Coin Master. One prominent URL, http://netcdn.co/app/431946152/gift-box-free-robux-game-hack, suggests a direct download for a malicious application. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or malware distribution scheme.

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/gift-box-free-robux-game-hack PDF link annotation
    • https://cnc-xinrong.com.tw/image/data/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-invisible-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-jailbreak-how-to-get-all-cars-free_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-free-online-unblocked_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-sites-reddit_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/mobile-hack-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-speed-and-jump-hack_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-hack-and-get-free-robux_GM431946152.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_off00002d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9A 22800 bytes
SHA-256: 121ad8887c8248fd02726ed205d4a8ef0ebf1b54fbd1ae8c663b736c1e881903
font_01_sfnt_off00006126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6126 18940 bytes
SHA-256: b01621e5f2b11abf9247ab73489c9871485613d8cfb55387c7c5c22f523293c5

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