Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9920b67f8a45ccd…

MALICIOUS

PDF

46.9 KB Created: 2021-06-02 08:22:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1fe5a79b68ae576d2c27d03625397b02 SHA-1: 7f28b834d481aaf5d4122716d11fed585d9c67d9 SHA-256: c9920b67f8a45ccd46b06fc1ebfc69e9cda62392aaa137ab5d250c2c02e6bc02
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as game hacks and free generators. The primary lure, 'A Hacker Is Threatening Me Roblox', and the associated URL point to a malicious website designed to trick users into clicking through. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious redirection behavior, likely intended to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/431946152/a-hacker-is-threatening-me-roblox-game-hack In PDF document text
    • http://sudamericarural.org/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-now_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://sudamericarural.org/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-roblox-script-executor_GM431946152.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
stream_004_off000054ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54EA 26900 bytes
SHA-256: 3cc50372afc576ec5a53f4fd7261c604b4f25ca3298493397115dc0cfe720d73
font_01_sfnt_off00009282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9282 19056 bytes
SHA-256: d0650e41ef637e6f4c698e2a237327ff99597637ae52c51ef0e24ec02f2c2e14

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