Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc91a600f60f9db9…

MALICIOUS

PDF

35.9 KB Created: 2021-06-27 02:17:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a69270ab10ee14d14d1c3615afbe47bb SHA-1: 39072fd3550f389dd85d0be7f9661601ef1b7d3d SHA-256: bc91a600f60f9db95919a9645cec2e3ef16fbaebea9d122b195f794b410c2b88
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to a redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The ML classifier strongly flagged this PDF as malicious. The document body and heuristics indicate a lure to download a payload, likely involving JavaScript, from the provided URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/how-to-get-free-robux-using-javascript-game-hack In PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-vector-roblox-logo_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/robux-hack-apk-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-doi-hack-in-roblox-games-to-get-gold_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-roblox-cards-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-shaggy-old-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-hack-pc_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/goku-ui-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-synapse-roblox-exploit-13-05-18_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://www.semrush.com/prices/In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F6 22956 bytes
SHA-256: 8a5a74bf3f0059866b8d7fab8aec78498a4fa58e3031689623b0213783d9ce2f
font_01_sfnt_off000065a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A5 19560 bytes
SHA-256: 4151c55a454c49fcb6d5dc58949a7b2ba798a9a9af913ba5165bd438a9669ddd

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