Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc83f74e11d73da2…

MALICIOUS

PDF

35.3 KB Created: 2021-06-29 12:34:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8153695b25c21e14587ea921eba2e90b SHA-1: d9ef36d9ecd01c70a89e049846099f8b423fc1be SHA-256: fc83f74e11d73da208e8380662c166c1b16ac8746f3e07b300d6223970c0ac68
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a high-severity heuristic firing for linking to a 'free generator / game hack' redirector, specifically http://netcdn.co/app/431946152/roblox-hack-2021-free-game-hack. This lure, combined with the ML classifier's strong positive prediction, indicates a likely attempt to trick users into downloading malware or visiting a phishing site. The document body and embedded URLs reinforce this lure by referencing game hacks and free generators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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/roblox-hack-2021-free-game-hack PDF link annotation
    • https://www.metal.hr/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-get-pokeballs-in-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/roblox-coregui-hack-making_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-hack-a-site-to-give-you-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-star-wars-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/roblox-c9m_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn 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_off00003076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3076 23140 bytes
SHA-256: 893f57eecd16f51e74643f90b3e3cf3dd16f7bd83a5bf5db30c0fa4b51273100
font_01_sfnt_off00006461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6461 19224 bytes
SHA-256: 3cde4f55a2bdd4deb3b89ab32bfc8b2e0dd9951ec02d4fb2f90c6201bfa37c0a

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