Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b819ae73642e3f…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 00:36:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a48fa6e6123bc11d20bccba0338261c3 SHA-1: 545bd1d87669d02ba59cba3333bb790c97d9ec45 SHA-256: 88b819ae73642e3fb999e5ab0816bcca6c0322adb1eeddb8a83c5f38ed63e305
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting free Robux and game hacks. The document body and embedded URLs strongly suggest a social engineering lure to trick users into visiting potentially harmful websites. No scripts were extracted, but the primary attack vector appears to be the redirection to malicious sites, likely for credential harvesting or further malware delivery.

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.tw/app/431946152/sites-to-get-free-robux-game-hack In PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/wiki-free-robux_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-download-roblox-on-computer-for-free_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-generator-download_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-get-free-admin-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/procodes-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-rixty-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/hack-roblox-site_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/roblox-piano-keyboard-hack_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/roblox-free-bundles_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_off00002f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F66 22144 bytes
SHA-256: afecf76d971c9824e5c320fd275b4e57c01bdaf58752daef1b3feec81edb6ed7
font_01_sfnt_off000060a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A7 18940 bytes
SHA-256: 12a760e2c1ec97f90af30afb205c0b6409d60b5d12cf2c59927e5ecc658ee3cf

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