Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a85c48ab4a8b4de…

MALICIOUS

PDF

43.6 KB Created: 2021-05-16 15:38:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0e59af73a41821811ad8da97aaa13efc SHA-1: f2c8e360e25b87185ddbfad5985ac4b8fbee2d26 SHA-256: 7a85c48ab4a8b4de1cc2d38169a557db5af74c41dd00762430a9bb66736d7029
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which are structured as SEO-optimized PDF links, suggesting a link farm or content aggregation tactic. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with the document, likely by clicking the embedded links. The primary URL points to content related to hacking Roblox accounts, further supporting a scam or phishing lure.

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/how-to-hack-roblox-accounts-passwords-game-hack
    • https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/roblox-hack-download_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/roblox-how-to-get-free-clothes_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-card-hack-app_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/lazyblocks-com-free-robux_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/free-roblox-hair-to-wear_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-hack-online_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/free-robux-android_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-get-free-robux-without-surveys_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-free-spins-without-verification_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/earn-robux-sites_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/minecraft-font-free_GM479516143.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-spin-and-coins-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a3e.bin
f506383974c4c822254076585e1ac18dd43ed78f2032800996f6104b08e88569
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A3E 26144 bytes
font_01_sfnt_off000085e8.bin
1a35cdd5966ddf5a07fa4c0cf1a4b7623ebf18d314e768fc1998c6779142cc7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x85E8 18916 bytes