Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7e9df0da660d31…

MALICIOUS

PDF

48.2 KB Created: 2021-06-04 04:25:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 39fffe61ffd1b6ff8028059360965330 SHA-1: 27d2da20e80d97ec3863f159cfc7f8b77801c703 SHA-256: ae7e9df0da660d31d1b6717c50d4dfdad132cf12775c7c53ac4e577451636694
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one prominently displayed in the document body and heuristics, that lead to a 'free Robux generator' lure. This lure redirects to a malicious URL, indicating a phishing or scam attempt. The presence of multiple PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/free-robux-generator-no-human-verification-2021-game-hack PDF link annotation
    • http://library.imz.or.id/repository/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-tiktok-followers-without-survey_GM835599320.pdfIn PDF document text
    • http://library.imz.or.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/pokemon-go-free-legendary-hack_GM1094591345.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/games-on-roblox-that-give-you-free-stuff_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5027 25164 bytes
SHA-256: d75d3f91761eeb1d5fc25bcc012bc67ac306b369185440133f10faba9fbadb9c
font_01_sfnt_off00008a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A00 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000096a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96A8 19260 bytes
SHA-256: cfeb00e99c7da41c79bd6814c2de1bf58f441159bdfe452787b9448ffd27beb4

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