Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cc161cac07b3bf…

MALICIOUS

PDF

33.8 KB Created: 2021-06-23 10:34:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fda635805ed305c0cac75342633db3e0 SHA-1: d8f0fd8c453511d67e95682f395a393f58a91f2d SHA-256: e3cc161cac07b3bf8dbb8bd40f211b21f3fd02cdcb2c94b83c5092718e51ce9d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'generators' for popular games like Roblox. The heuristic firings confirm these links are associated with malicious redirectors and game hack lures. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into visiting potentially harmful sites, likely as a first step in a phishing or malware delivery chain.

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/boku-no-roblox-cheat-game-hack In PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/april-1st-hack-roblox-wiki_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/roblox-data-breach_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/www-roblox-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-more-free-coins-on-coin-master_GM406889139.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_off00002f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F17 21716 bytes
SHA-256: 8e9d6cc2fe83c33d65e23fbe43f94e6ee0bf273529c5a8b3fac270f825f9a38d
font_01_sfnt_off00005ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC9 19064 bytes
SHA-256: e5b6f503d82e79fd144ce3ae1c347b6d3f14686932a3b7529dbdd487fdefe938

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