Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6518adc70ffc5af…

MALICIOUS

PDF

33.2 KB Created: 2021-06-25 21:54:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c0b4567a79f338811ee92757330d511d SHA-1: a1401266176453e4e42b57099928d264154bd471 SHA-256: f6518adc70ffc5afae0cf8743c7198e6f01c5bc76b12245aecf33a617dc5f9d1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and text lures related to 'free Robux' and game hacks, directing users to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The primary attack vector appears to be social engineering to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-robux-no-scam-or-hack-game-hack In PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-naruto-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/ww-roblox-come_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/robux-free-page_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/roblox-hack-root_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-get-free-pokeballs-in-pokemon-go-2021_GM1094591345.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/roblox-hacks-ru_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-modify-stats-in-roblox-using-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-get-free-nike-shirt-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B83 22116 bytes
SHA-256: a4ed4257bfb2a21653c255ed88ac61cd71ca5d069968e5f9a44f884e79430d8d
font_01_sfnt_off00005cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB8 19148 bytes
SHA-256: 53783bf833e1487b1577ba7087ce9e93ada1d3c4b5a89f240b9a9b52598f10a6

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