Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba82ee2b85190a1…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 07:32:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 662267591b17828e2010bd99077a01ed SHA-1: 3ab10c51828bc1928046d5a20f007ab6f3c04b7e SHA-256: 8ba82ee2b85190a1dfd7c9ddce2cd7ea45ae0230041c4951854401c7be17f6fc
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of links designed to appear as SEO-optimized content, primarily related to game hacks and free currency for popular games like Roblox and Coin Master. The links redirect to other PDFs or landing pages, such as http://netcdn.co/app/431946152/www-rbxhut-com-game-hack, which likely serve as a gateway to further malicious content or malware downloads. The ML classifier strongly indicated maliciousness, and the sheer volume of generated SEO links points to a link farm or phishing operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/www-rbxhut-com-game-hack PDF link annotation
    • http://aeridefense.com/image/data/files/websites-that-give-you-robux-for-free_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-hack-roblox-no-downloads-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-robux-free-2021-an-fr_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-hack-draw-it-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/hack-for-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-movie-websites-tiktok_GM835599320.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-login-to-cerberus-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/cheats-for-tower-battles-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-robux-without-human-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/will-minecraft-dungeons-be-free_GM479516143.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
font_00_sfnt_off00002dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD9 22040 bytes
SHA-256: 1c63a84f1f9bce9958df21882a6c626458cf47f4d0cf7cd3232636e18ea59f53
font_01_sfnt_off00005e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E91 19444 bytes
SHA-256: 60eab2e3afd0c7635d159dc58d933a25f8ff147bbc023de726d63f5eb8f1c975

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