Malicious PDF — malware analysis report

Static analysis result for SHA-256 642f0a225ea95ead…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 05:32:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 10293cb602499ac41eb817a91f2d53d8 SHA-1: c8659b27ad441854e5001c675866ea9dbf8c4b0e SHA-256: 642f0a225ea95ead51161f3bfca1f3a4c561845ce75ee7ae597abbe7b7c24b71
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to pages offering in-game currency or hacks. The document body and extracted URLs suggest a lure for free spins or robux, which is a common tactic for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-free-spins-link-today-new-2021-game-hack
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey_GM431946152.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/free-hacks-for-coin-master_GM406889139.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/minecraft-pocket-edition-free-apk_GM479516143.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/free-attacks-coin-master_GM406889139.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-free-pet-food-links_GM406889139.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-ids-for-free-spins_GM406889139.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-free-spin-sites_GM406889139.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/can-i-download-minecraft-for-free_GM479516143.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-hack-software-download_GM406889139.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/free-spins-coin-master-cheat_GM406889139.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/free-2021-robux_GM431946152.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/free-robux-hack-us_GM431946152.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/pubg-uc-earning-app-in-pakistan_GM1330123889.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/tiradas-coin-master_GM406889139.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/how-you-get-free-robux_GM431946152.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/robux-earner_GM431946152.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/tryrbx-site-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051c4.bin
391e20d33ad2d3cce99a98663ff0fee980597ef0081b1d6471fc37acbd60a8f8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C4 24596 bytes
font_01_sfnt_off000088f8.bin
9ab4b87832590d82aec569b9c8693c2016d5d9151569e528de1ed13ad8a1cb2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88F8 18976 bytes

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