Malicious PDF — malware analysis report

Static analysis result for SHA-256 693edc81da198970…

MALICIOUS

PDF

34.1 KB Created: 2021-07-07 15:10:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2352e8d2c0878ac24e3564511387d2d0 SHA-1: 7775bf63bbca4e1295271522a9736baa61d0868f SHA-256: 693edc81da198970783ac9b8f43b7d167a401e354159f614eb01f8502c370a83
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of links to external PDFs hosted on an IP address, masquerading as cheats or free items for popular games. This is indicative of a link farm designed to trick users into downloading potentially malicious files. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-optimized PDF links further supports a malicious intent to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/431946152/free-robux-gift-card-game-hack
    • http://118.98.227.172/opac/repository/can-xbox-players-hack-eachother-roblox_GM431946152.pdf
    • http://118.98.227.172/opac/repository/roblox-how-to-get-vip-for-free_GM431946152.pdf
    • http://118.98.227.172/opac/repository/coin-master-free-coins-link_GM406889139.pdf
    • http://118.98.227.172/opac/repository/how-to-hack-roblox-top-model-points_GM431946152.pdf
    • http://118.98.227.172/opac/repository/money-hack-for-roblox-jailbreak_GM431946152.pdf
    • http://118.98.227.172/opac/repository/free-roblox-no-plsy-stor_GM431946152.pdf
    • http://118.98.227.172/opac/repository/free-spins-coin-master-daily_GM406889139.pdf
    • http://118.98.227.172/opac/repository/free-robux-no-password_GM431946152.pdf
    • http://118.98.227.172/opac/repository/free-script-executor-lvl-7-roblox-5-18_GM431946152.pdf
    • http://118.98.227.172/opac/repository/roblox-shirt-template-free-shipping_GM431946152.pdf
    • http://118.98.227.172/opac/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdf
    • http://118.98.227.172/opac/repository/rexima-roblox-cheat-for-apocalypse-rising_GM431946152.pdf
    • http://118.98.227.172/opac/repository/kazok-how-to-hack-roblox-accounts_GM431946152.pdf
    • http://118.98.227.172/opac/repository/roblox-free-logins_GM431946152.pdf
    • http://118.98.227.172/opac/repository/how-to-buy-robux-for-free_GM431946152.pdf
    • http://118.98.227.172/opac/repository/roblox-hack-rbx-juin-2021_GM431946152.pdf
    • http://118.98.227.172/opac/repository/free-robux-no-hacks-roblox-approved_GM431946152.pdf
    • http://118.98.227.172/opac/repository/roblox-hacker-mod_GM431946152.pdf
    • http://118.98.227.172/opac/repository/how-to-get-roblox-credit-for-free_GM431946152.pdf
    • http://118.98.227.172/opac/repository/roblox-hack-all-games_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002d01.bin
c2f16171ecb072516d5f7ee623fe40be871b28ef5e97fa328ea1acaab18e3775
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D01 22788 bytes
font_01_sfnt_off00006013.bin
5d60391c622a458b14b8fa69ffb952c1d3cbb56e74fa158a34f16b9612198a82
pdf-font-stream PDF embedded font (sfnt) at offset 0x6013 19112 bytes