Malicious PDF — malware analysis report

Static analysis result for SHA-256 3091359908b4e822…

MALICIOUS

PDF

47.8 KB Created: 2021-06-09 17:41:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 26c94d66ef6782a0ceb2c4e20424765a SHA-1: d53dbeb662437a4e71c11afede27c7a4e36e1ce3 SHA-256: 3091359908b4e82274a5a20045aaeed538d72897b398c0dd009b7d3a3f11299d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or 'game hacks' as a lure. The primary redirect URL is https://netcdn.tw/app/431946152/free-robux-only-half-to-use-username-game-hack, which is flagged as a malicious redirector. The document body and heuristics confirm this lure-based redirection strategy, indicating a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/free-robux-only-half-to-use-username-game-hack In PDF document text
    • http://neltalen.nl/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/get-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/minecraft-pe_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/ok-google-free-roblox_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-lcoins-hack_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/robux-generator-robux-cheat-roblox-hack_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/free-shirts-on-roblox-2021_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_004_off00005452.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5452 24356 bytes
SHA-256: f5c891ca70e2e766e0f7a22cd84ac72a1a63df8f835b44d21eb5bfb6ec6c9c7c
font_01_sfnt_off00008c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3B 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000095ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95EA 18944 bytes
SHA-256: d5067477846c983a7561a1df0fa5900057c5fb7589ab63d40a1aa20d24a275e2

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