Malicious PDF — malware analysis report

Static analysis result for SHA-256 61709381e45a5c48…

MALICIOUS

PDF

45.0 KB Created: 2021-05-12 14:04:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bb84be56f6bf9773f7001811319f78a4 SHA-1: d980b098d5ef816d229d2b582d9f188e92eae1f0 SHA-256: 61709381e45a5c4864c686a0d84b8c3fdfb671baf79354913364ba883587f274
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites, many of which appear to be related to game hacks and cheats. The ML_NYX_PDF_MALICIOUS heuristic also flagged this PDF with high confidence. The document body, though partially corrupted, contains references to 'Coin Master Free Gold' and a URL, suggesting a lure for users interested in such topics. The presence of these links indicates an attempt to redirect users to external, potentially malicious content.

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-gold-game-hack PDF link annotation
    • https://jasabuatlabel.com/ckfinder/userfiles/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/how-to-get-robux-fast_GM431946152.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_off00004b9b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B9B 24844 bytes
SHA-256: 833e1e99b2ec8d9d0ac8af21cd6b6101533ed58b1ba487cbb332ebd70dfaa72e
font_01_sfnt_off000084bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84BF 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E71 17960 bytes
SHA-256: aba9a61c61b61fea048b73d77d5e297f3d5a3a83c57e433c8854d820da1f91b9

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