Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b91c3f912c2db1a…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 16:04:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ab79921fb9ce29f4a4563d0450d6b96d SHA-1: 211aaa74b198540e47c03383e91d6c28bfabc1b3 SHA-256: 6b91c3f912c2db1ac41815578b898b207f9529284bc273efc249159285553a26
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary lure URL is 'https://netcdn.online/app/431946152/how-to-get-roblox-premium-for-free-2021-game-hack'. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/how-to-get-roblox-premium-for-free-2021-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robux-survey_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/rewardrobux-com_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robux-website_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-generator-2021-no-survey_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_off0000503c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x503C 26572 bytes
SHA-256: ea04333bcbad06ee1bb9bed3ee659aeaad3573bc66883917202e46d73edda52d
font_01_sfnt_off00008d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D78 19292 bytes
SHA-256: f40355f8d73764334de65774b58428be6642d496c7c5bf19d3a36d7b89996382

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