Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2d3c4c7e44c3c1…

MALICIOUS

PDF

44.7 KB Created: 2021-05-13 23:36:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4c864b58c7b110c0311fda9498898f9a SHA-1: a897c50ff7cde266383230eb8edbb03cd5354cf8 SHA-256: 0e2d3c4c7e44c3c182e463df0fad3a9167c7c71f15511c6fdeaebdec110228e1
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to PDF files related to game hacks and free accounts. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier flagged the PDF as malicious. The presence of a 'download button' lure further suggests a malicious workflow aimed at tricking users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-free-spins-and-coins-2021-game-hack
    • http://aiyta.com/images/roblox-gift-card-online-free_GM431946152.pdf
    • http://aiyta.com/images/coin-master-hack-tool-v1-9-download-free_GM406889139.pdf
    • http://aiyta.com/images/roblox-mobile-hack_GM431946152.pdf
    • http://aiyta.com/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://aiyta.com/images/but-link-says-free-robux_GM431946152.pdf
    • http://aiyta.com/images/roblox-assassin_GM431946152.pdf
    • http://aiyta.com/images/free-minecraft-mods-for-ps4_GM479516143.pdf
    • http://aiyta.com/images/coin-master-hack-ios-no-jailbreak_GM406889139.pdf
    • http://aiyta.com/images/free-minecraft-client_GM479516143.pdf
    • http://aiyta.com/images/coin-master-cheat-apk-free-download_GM406889139.pdf
    • http://aiyta.com/images/how-to-get-infinite-robux_GM431946152.pdf
    • http://aiyta.com/images/free-robux-without-human-verification-2021_GM431946152.pdf
    • http://aiyta.com/images/minecraft-free-download-ios_GM479516143.pdf
    • http://aiyta.com/images/give-me-robux-now_GM431946152.pdf
    • http://aiyta.com/images/free-robux-roblox-promo-codes_GM431946152.pdf
    • http://aiyta.com/images/how-to-win-free-robux_GM431946152.pdf
    • http://aiyta.com/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdf
    • http://aiyta.com/images/rewards-roblox_GM431946152.pdf
    • http://aiyta.com/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • http://aiyta.com/images/free-robux-by-watching-ads_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049c0.bin
ae93c32e43df3d5181d4f27ff41472152b8a4eadb49f196c1f049d3e0135dca4
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C0 24520 bytes
font_01_sfnt_off000081c1.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
pdf-font-stream PDF embedded font (sfnt) at offset 0x81C1 2840 bytes
font_02_sfnt_off00008b73.bin
c259e1f543e24e5bfe6ce8cf601a342cc00786119f62dbfadbed712250492c46
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B73 18460 bytes