Malicious PDF — malware analysis report

Static analysis result for SHA-256 0519dd7a0e1ee57b…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 15:44:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cecbbb88f1992666a6647ddb30b30a40 SHA-1: 1e1b2afc2c2b83f47ec5f466d2fdec0d81f3e1a2 SHA-256: 0519dd7a0e1ee57bfa555b203c956efd7bf4211fd30bf7a0e2a34d4312c745e2
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/free-robux-legit-works-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/free-account-on-roblox-with-obc_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hack-rebirth-in-ice-cream-simualtor_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-anti-hacking-saving_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-game-hack-scripts_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-zephplays_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-gift-card-codes-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/adopt-me-roblox-hack-money-free-youtube_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/cheat-codes-roblox-solar-strike_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_off00002ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA8 22236 bytes
SHA-256: 344bd63bc35aa6e8152a3fe46f28b393f744ba4530f70c0f0d2b9029780591bb
font_01_sfnt_off0000604d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604D 19308 bytes
SHA-256: 9efd2e093a3da7b4df577c940df39a6f115393dd9316eb24aaeeedf4b0f62f6e

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