Malicious PDF — malware analysis report

Static analysis result for SHA-256 110ca8278188231f…

MALICIOUS

PDF

47.4 KB Created: 2021-05-17 05:57:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5a766a54384552c816cb517a1bbbeab7 SHA-1: 5ad64e2c6e40d1d2b5e9f7f235d219e7d963d603 SHA-256: 110ca8278188231f30184f9a14da13fd8343bd621676cae9ba1f22a84153d469
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a malicious lure, employing a fake CAPTCHA or human verification prompt to trick users into interacting with embedded links. The document contains a large number of external links, many pointing to PDF files with SEO-optimized titles, suggesting a link farm or content-spinning operation. The primary URL, 'https://netcdn.xyz/app/431946152/free-robux-generator-no-verification-2021-game-hack', likely serves as the initial download or redirect point for a secondary payload. No scripts were extracted, but the PDF structure and heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-robux-generator-no-verification-2021-game-hack
    • https://gastronomytours.gr/ckfinder/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/coin-master-game-free-play-online_GM406889139.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/coin-master-hack-2021-without-human-verification_GM406889139.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/free-coin-spin-daily-link-coin-master_GM406889139.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/apps-to-get-free-robux_GM431946152.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/free-private-server-roblox_GM431946152.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/hack-coin-master-free_GM406889139.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/coin-master-daily-free-spin-app_GM406889139.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/how-do-you-get-roblox-money_GM431946152.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/get-free-robux-now_GM431946152.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/ways-to-earn-robux_GM431946152.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/coin-master-free-spin-facebook-link_GM406889139.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/free-games-coin-master_GM406889139.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/como-hackear-coin-master-gratis_GM406889139.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/fast-robux-online_GM431946152.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/roblox-devil_GM431946152.pdf
    • https://gastronomytours.gr/ckfinder/userfiles/files/bux-gg-robux-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c25.bin
b3fb27ac71fabfa7f720574acd8186250b0d5f09abbfe564cab21913436fc3ac		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C25 26192 bytes
font_01_sfnt_off0000879f.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879F 5696 bytes
font_02_sfnt_off000094b1.bin
d45ec0ea85e3f4da21cb27ccd2cd6df352304457fff04a0939a67aeffe4f8bf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B1 19004 bytes

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