Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c2f0f5a76b0629…

MALICIOUS

PDF

33.9 KB Created: 2021-06-28 23:29:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ac819219ec0984d99d4ec7be45f807d3 SHA-1: ab256725464826e4cb95dc6eeb893177bbb4bee4 SHA-256: 18c2f0f5a76b0629f0ee0870c811cd6c30dc2f344bc0b77ace6870180381b28e
142 Risk Score

Malware Insights

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

The PDF contains numerous links, including one directly to a 'redeem codes to get free Robux' lure, indicating a scam or phishing attempt. The heuristic firings confirm this is a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/redeem-codes-to-get-free-robux-game-hack PDF link annotation
    • http://lib.untad.ac.id/repository/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/tbc-oil-platform-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hacks-for-booga-booga_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/mega-cheat-robloxcom_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/follow4follow-free-followers-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/mc-hacks_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-area-14-hacking-script-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/jetpack-simulator-hack-roblox-v3rmillion_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/accounts-that-give-free-robux-when-you-visit-it_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-roblox-so-you-can-get-robucks_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hack-weight-lifting-simulator-2-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-win-free-robux_GM431946152.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_off00002d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D10 22284 bytes
SHA-256: 3e5603aa2a04472f0fa03c825e4cc98972a4dce17781440b75cbb36578446662
font_01_sfnt_off00005ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC9 19252 bytes
SHA-256: 3ae652b7d9599493602ca658a9d2babfa1780523b33fb8f5b46d6cec86126200

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