Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1c1e1afde06b7c…

MALICIOUS

PDF

43.2 KB Created: 2021-05-16 16:16:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 34c3823386befa216ad84bd2b2abc09c SHA-1: abcb877c9fcfb34da45db7c0315685e4313e744f SHA-256: 2a1c1e1afde06b7c87710d8039d806e79c4fbaf2de820ed6c9ac43b4df7a7ecf
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a malicious lure, employing a fake CAPTCHA to trick users into interacting with embedded links. The document contains a large number of external links, many of which point to PDF files with SEO-like slugs, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of a fake CAPTCHA heuristic further supports a malicious intent, likely to download further payloads or redirect to scam pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-t-shirt-roblox-game-hack
    • https://begavalleymealsonwheels.org.au/images/hack-coin-master-8-ball-pool_GM406889139.pdf
    • https://begavalleymealsonwheels.org.au/images/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://begavalleymealsonwheels.org.au/images/bloxawards-com-earn-free-robux_GM431946152.pdf
    • https://begavalleymealsonwheels.org.au/images/coin-master-free-coins-and-spins_GM406889139.pdf
    • https://begavalleymealsonwheels.org.au/images/free-coins-coin-master-no-human-verification_GM406889139.pdf
    • https://begavalleymealsonwheels.org.au/images/links-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://begavalleymealsonwheels.org.au/images/get-more-robux_GM431946152.pdf
    • https://begavalleymealsonwheels.org.au/images/minecraft-windows-10-edition-free-download_GM479516143.pdf
    • https://begavalleymealsonwheels.org.au/images/free-spins-for-coin-master-2021_GM406889139.pdf
    • https://begavalleymealsonwheels.org.au/images/minecraft-thumbnail-maker-free_GM479516143.pdf
    • https://begavalleymealsonwheels.org.au/images/free-minecraft-windows-10-account_GM479516143.pdf
    • https://begavalleymealsonwheels.org.au/images/earnrobux_GM431946152.pdf
    • https://begavalleymealsonwheels.org.au/images/robux-gratis_GM431946152.pdf
    • https://begavalleymealsonwheels.org.au/images/coin-master-pc-hack_GM406889139.pdf
    • https://begavalleymealsonwheels.org.au/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • https://begavalleymealsonwheels.org.au/images/earn-free-robux-on-roblox_GM431946152.pdf
    • https://begavalleymealsonwheels.org.au/images/free-spins-coin-master-app_GM406889139.pdf
    • https://begavalleymealsonwheels.org.au/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • https://begavalleymealsonwheels.org.au/images/roblox-no-download-hack_GM431946152.pdf
    • https://begavalleymealsonwheels.org.au/images/how-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ba7.bin
2601b71760312d429642afd098a3e2a037a97dd2f7b899483ee9dac28b5350f5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA7 25240 bytes
font_01_sfnt_off00008665.bin
2d05e254e9d88d662aa6e20ca1badb4d8e3c9bd921fc5d0ad34db7ef5b503ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8665 18340 bytes

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