Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54c9550a5d65e77…

MALICIOUS

PDF

46.2 KB Created: 2021-05-17 00:40:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 643898d892724137bd612c9106725d0e SHA-1: 66b55379420e1eea99de5ad5e539cb005f73c6ae SHA-256: d54c9550a5d65e77b2a4096c51603e91b0c732d37c5b8b41755405dca94e5357
102 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to websites offering game-related cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or phishing attempt designed to redirect users to potentially harmful sites. The document body, though partially corrupted, contains references to "Coin Master Free Spins" and a URL, reinforcing the scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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-link-today-new-game-hack PDF link annotation
    • http://killebergsridsport.se/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000487d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x487D 28344 bytes
SHA-256: 69778e12e15044cf08687fd212ced86922908398d4effce65fec3556c0a9ec56
font_01_sfnt_off00008799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8799 2812 bytes
SHA-256: fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
font_02_sfnt_off00009139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9139 18572 bytes
SHA-256: 51c95658009ee6a6ae875a8d4133a79c51d36fbd34bac1203a2f2fe060da7c96

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