Malicious PDF — malware analysis report

Static analysis result for SHA-256 930253e5e1202cc5…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 09:36:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 228755fd3d728994ddc856d112944edf SHA-1: e42e3be197d337c588790e6569d8f70bb79b4f76 SHA-256: 930253e5e1202cc5a884191d9a62dd4f4f91b3e177ecb462124236da33a4606a
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links and a specific external URI, strongly suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of many links to other PDFs indicates a potential distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/how-to-hack-coin-master-spin-ios-game-hack
    • https://griyafirdaus.com/ckfinder/userfiles/files/coin-master-golden-card-hack_GM406889139.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/roblox-cheat-engine-download_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/roblox-trolling_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/free-spins-on-coin-master-iphone_GM406889139.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/free-spins-for-coin-master-app_GM406889139.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/how-to-get-free-stuff-roblox-2021_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/how-to-hack-roblox-passwords_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/get-free-spins-coin-master-link_GM406889139.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/how-to-get-free-roblox-money_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/how-to-get-5-million-free-robux_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/free-robux-with-no-verification_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/huskybuscom-free-robux_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/rbx-free-robux_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/monaco-base-roblox-hack_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/hacking-roblox-accounts-passwords_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/minecraft-gun-mod-download-free_GM479516143.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/how-to-get-bloxburg-for-free-roblox_GM431946152.pdf
    • https://griyafirdaus.com/ckfinder/userfiles/files/moon-tycoon-side-roblox-hacks_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003032.bin
ba4c647b0254501543aa5175279b657666a1b8a7ff1a7ab7e142c9e2f4c9eefb
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3032 22204 bytes
font_01_sfnt_off00006196.bin
26c495ddad6d19752d7b7d64abb9194f782c68fd49d6baac122766a6904e49cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 18344 bytes