Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27500cfec52d543…

MALICIOUS

PDF

44.0 KB Created: 2021-05-17 03:06:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e475fb503981d8742d58f5f4f9eee778 SHA-1: 857ec86ccf8d368a8da8cd0b416a1cf4e2f1015d SHA-256: f27500cfec52d54363a63b88b0cc8434f911ca0d163d4ec5c798401e00444427
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering free in-game currency or items. The ML classifier and PDF link farm heuristics strongly indicate malicious intent. The document body and embedded links suggest a lure for popular games, likely to facilitate phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/robloxhero.xyz-free-robux-game-hack PDF link annotation
    • http://fmbompastor.com.br/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://fmbompastor.com.br/images/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://fmbompastor.com.br/images/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b11.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B11 27576 bytes
SHA-256: 0df514e812f5731d04e3abc8676a2ba623a772fcd31e22d34a7a5e6224cb714f
font_01_sfnt_off0000890b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x890B 18584 bytes
SHA-256: d96645d743d7bc7e16305d404e9ae036d13b2ec1544ce4a3e073a2af54c3cd1e

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