Malicious PDF — malware analysis report

Static analysis result for SHA-256 9835b21f1ed4eaba…

MALICIOUS

PDF

34.9 KB Created: 2021-06-20 22:33:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dababd6a8cccf37598c27b38da9a84be SHA-1: 917e68db98f398eeb605963eec046b4a05e95065 SHA-256: 9835b21f1ed4eaba33525dedc5f24ff486f95738196f79da5e3b1687c4d0807b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency ('Robux') and game hacks, which is a common social engineering tactic. It embeds a link to a known malicious redirector infrastructure, http://netcdn.co/app/431946152/free-account-roblox-with-robux-game-hack, which is likely used to deliver a secondary payload or phish for credentials. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-account-roblox-with-robux-game-hack In PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-avatar-roblox_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/oprewards-robux_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/roblox-promo-code-to-get-free-robux_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
font_00_sfnt_off00003347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3347 21680 bytes
SHA-256: 268b1ae2647f1cb13686d0ee968aa31d2b0cf7552b030b855fdd9abbbd6260df
font_01_sfnt_off000062b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B6 19376 bytes
SHA-256: aca93b4e3f604d5c7fb305f64f27e26b52b7bc87275afcbcda3d4758617aefe4

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