Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dca9838a9b58144…

MALICIOUS

PDF

35.5 KB Created: 2021-06-27 06:45:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 71df61497abe15889615f0ba7e513762 SHA-1: 4843b528b5ad29ed937ecad2988893217010abde SHA-256: 6dca9838a9b5814480d176494e2fbbb2389579439f393153274cac93448f257a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary lure URL is http://netcdn.co/app/431946152/how-to-hack-roblox-wild-savannah-inf-health-hack-game-hack. While no scripts were extracted, the embedded URLs and the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic indicate a social engineering attempt to drive traffic to potentially harmful sites, likely for further malware delivery or phishing.

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-hack-roblox-wild-savannah-inf-health-hack-game-hack In PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-monster-parts-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/mod-menu-hack-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/cowboy-tshirt-roblox-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/bloxawards-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/assasin-roblox-sccript-hacks_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/aimbot-hack-for-roblox-cbro-fps-gui-10_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/descargar-hack-de-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-change-my-roblox-name-for-free_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_off00003129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3129 22692 bytes
SHA-256: 9535a4a7c22f2bb8bc00d84cd4a0e955cac2f1f2a3bf73c85cb78901f656864e
font_01_sfnt_off000063bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BC 19696 bytes
SHA-256: cc6e02e28a64f3ea08764eca20b0fa61b87f4150dd9d2a35da3966ab821b6445

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