Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1a5e4a9231726c…

MALICIOUS

PDF

42.3 KB Created: 2021-05-19 02:39:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 098bbd11d5da38b6518ed262ac9c9d83 SHA-1: 31316f64842b35959f7de9fc85a7b5df26f27d41 SHA-256: 4a1a5e4a9231726c13d9370c62519925dd49479a54650dfce512ccf49fb7a959
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free generator / game hack" lures. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-free-spins-blogspot-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirection workflow designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-blogspot-game-hack In PDF document text
    • http://bressanassessoria.com.br/images/tiktok-free-auto-views_GM835599320.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/village-coin_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/cheats-coin-master-free_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/www-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/show-me-how-to-get-free-robux_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
stream_003_off000049e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E3 25636 bytes
SHA-256: f5787622f33f574fcb0cb330216736484256f5e8ccb03bea17fe80679b0dfdd0
font_01_sfnt_off000082a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A4 18464 bytes
SHA-256: 7f13c81e41627db5de1fdc011b77043c9877b216986226f08b9acd2eded814ce

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