Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff085f5b539e55a…

MALICIOUS

PDF

36.0 KB Created: 2021-06-27 01:19:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b1a696cb1d36ac616e26e71e577f8700 SHA-1: 6bb84489b73eeaf4be3ffb75adb9e5ed35473c9d SHA-256: 1ff085f5b539e55a3525cba7d592309e18ae0eeaeffa82c9287a87698dd2fde8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing SEO-optimized links to redirect users to external sites offering 'free generators' and 'game hacks'. The document contains numerous links to PDF files hosted on loba.com.vn, which appear to be part of a link farm. The primary URL http://netcdn.co/app/431946152/free-math-games-online-roblox-game-hack is likely a landing page for malicious content or further redirection.

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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.co/app/431946152/free-math-games-online-roblox-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/good-hacks-to-do-with-a-hang-glider-roblox-treelands_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-shinobi-life-free-spins-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-gift-card-codes-december-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/dbz-rage-roblox-stats-hack_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/www-we-hack-com-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-shark-teeth-in-sharkbite-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-free-robux-hack-online_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32DE 23084 bytes
SHA-256: 65676a49b234500840a4fc178bc58e42f120621bf178c92b4caa95ee8d4cd79b
font_01_sfnt_off000066d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D5 19496 bytes
SHA-256: 5778e6365dfadedc73c6561b0632eb73b050ac59ba8437fa13281c167b964479