Malicious PDF — malware analysis report

Static analysis result for SHA-256 4971dfe1fb8e85e4…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 09:20:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 882d1e0d01ea311ddb3735a431a6c810 SHA-1: 8c6d56efdeb182be79d960e82ea55f3365d7ff07 SHA-256: 4971dfe1fb8e85e4360790203d4f412fef720dd896bd7849795de6e64561ac18
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.tw/app/431946152/how-to-get-free-robux-fast-and-easy-game-hack PDF link annotation
    • http://lib.fekon.untad.ac.id/repository/roblox-redeem-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/robux-hack-for-free-easy-no-download_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-hack-de-cuentas_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/cheat-roblox-csgo_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-advertisement_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/games-on-roblox-that-give-you-free-stuff_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-dashing-simulator-hack-script-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/name-that-character-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/a-code-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-legit-august-20_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-black-clover-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-cheat-on-da-hood-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-daily-free-spins-link-today-blogspot_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
font_00_sfnt_off00003185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3185 21676 bytes
SHA-256: a5174794c5ba557bda86c2aa3c0061630ae739472a422b15e6e52e218a8d1e87
font_01_sfnt_off000060eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 19340 bytes
SHA-256: e9e0cf1ab6f783e57183aba6e7ab34e8b0edef29a09b47d1de428d0435b690df

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