Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfd55f37590cbf6…

MALICIOUS

PDF

34.4 KB Created: 2021-06-18 02:29:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7dffc62beb9d1fce6bf3be3fd02f3fbf SHA-1: 00328857cbcbdcefeb81c586f64f495e7e9df5bc SHA-256: 8cfd55f37590cbf65b893bc3d48aef153b5f82656859f5624f2f9797022fe649
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for game hacks and free items, directing users to a malicious redirector. This redirector, in turn, hosts multiple other malicious PDFs, indicating a chain of malicious content delivery. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection behavior.

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/free-gucci-jacket-roblox-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-dungeon-quest-get-unlimited-gold-and-free-vip_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/phoenix-signs-hack-roblox-account_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-robux-free-no-download-quick-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/wearedevs-roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-admin-lua-script-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/cheats-for-meep-city-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-badge-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-buy-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-2021-link_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/20210-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/2021-free-migrated-acounts-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-hair-names_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.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_off00002fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDE 22168 bytes
SHA-256: 76ebaa3497b99db78fa52438ea914c58471c1802dc154da4ed5cc2ccd51d605a
font_01_sfnt_off00006122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6122 19164 bytes
SHA-256: 83bad50570edbf34fd40e1276e13c4e744515e1c9a273cad756f9fa892ac5ff0

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