Malicious PDF — malware analysis report

Static analysis result for SHA-256 0335521901bb5551…

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 01:35:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8bb1a055395021e45caa9320aeda9440 SHA-1: a373ba6e1249e963e6620b70a22f52c9036c9d61 SHA-256: 0335521901bb5551f9dc996d9409bb9e507a1fdaf22f08257632caa2d3250beb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game currency or hacks. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-robux-circleci-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-circleci-game-hack In PDF document text
    • http://modlingua.com/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/roblox-rewards_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/ash-shirt-only-the-free-ones-on-roblox-shopping_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://modlingua.com/images/rc7-for-roblox-free_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/roblox-park-forest-free_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/hack-skin-roblox_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/counter-blox-roblox-offensive-hack-script_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://modlingua.com/images/https-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/tiktok-free-6-months_GM835599320.pdfIn PDF document text
    • http://modlingua.com/images/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://modlingua.com/images/coin-master-official-fan-page_GM406889139.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_off0000509c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509C 28036 bytes
SHA-256: e8d74aaa02db6f458f95b6328386efe59e7513d17e8062d8429387b094dd79c4
font_01_sfnt_off00009027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9027 18208 bytes
SHA-256: c1520811e2145b5c6306ac933ec70240886c7211f511fc027468fe974f3cca3a

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