Malicious PDF — malware analysis report

Static analysis result for SHA-256 585232f629f581ab…

MALICIOUS

PDF

32.8 KB Created: 2021-06-19 13:27:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 556c3493f4948c7a27ba2d8221be6661 SHA-1: bc3e7a28c77cd43d91b60cd0d299a55f0b35a04a SHA-256: 585232f629f581abf57abe4a832d38c8ca219645c9c5480ef2bc500e8913d4b5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links disguised as 'free generators' or 'hacks' for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the document's structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/hack-fhantom-forces-roblox-game-hack PDF link annotation
    • http://perpustakaan-stikesmsb.com/repository/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-robux-legit-no-survey-or-scam_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/www-coinmaster_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-robux-no-human-verification-ios_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_off00002b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B61 21680 bytes
SHA-256: f93933c2e101c8fdc4c09c2fdf5dd7e479e661625aa2c52971ade24ab3764de1
font_01_sfnt_off00005ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD5 19352 bytes
SHA-256: d9e5fd66f9fe8f6dde32addb893e4a5194eb83208fdf670c7f3270d37f554eb3

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