Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7f4c61c27adb80…

MALICIOUS

PDF

35.5 KB Created: 2021-06-25 02:57:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d4e46968dc11cf0b2bbe6680517661de SHA-1: 5bedbfc1c4e13f1093fab05202029159d47061b1 SHA-256: cf7f4c61c27adb8007803040ccc7b5d3173b5be115c1e76d85de768ea1f427c1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDF files promising game hacks and currency generators for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious attempt to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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.co/app/431946152/free-roblox-gift-card-codes-2021-unused-game-hack PDF link annotation
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/robux-hack-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/how-to-use-hacks-on-roblox-deathrun_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/google-coin-master-free-spins_GM406889139.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_off0000314d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x314D 22776 bytes
SHA-256: 8fc97d88a043552207b7c4a38f6b7648ecbb1040716d3db633d7c42d27d712ab
font_01_sfnt_off00006425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6425 19588 bytes
SHA-256: d0050b22b1575b026cda5754e18fa76c7d99fd57f12d326042661e7eeaa340ba

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