Malicious PDF — malware analysis report

Static analysis result for SHA-256 168445bfa6975b2b…

MALICIOUS

PDF

45.7 KB Created: 2021-05-19 14:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1cc49c9e45d6a4034e953b59f3010a69 SHA-1: 7c8b395ddeed33f7389ef8d7bdfb9fef42fb5a2e SHA-256: 168445bfa6975b2b8785eff4493891a12a8391ec6718699ad8a0723fda282b84
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising "free generator / game hack" lures. The primary malicious link identified is https://netcdn.xyz/app/406889139/free-spins-coin-master-2021-today-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering attempt to trick users into visiting malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/free-spins-coin-master-2021-today-game-hack In PDF document text
    • http://bressanassessoria.com.br/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-800-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-now_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/likes-for-tiktok-free_GM835599320.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004947.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4947 25948 bytes
SHA-256: 4b33eaf4539313c65dce9944fe59b039f00114d9429419e574879debf75376cd
font_01_sfnt_off000083e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E1 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off00008ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBF 18644 bytes
SHA-256: fb34871543d4e589edaa7b6b6daea61d4b413826d533968c66bf721badb2f47c

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