Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0af8ce3ea8f620…

MALICIOUS

PDF

35.1 KB Created: 2021-06-28 01:54:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0dbd98aac41dd961b56220868b449273 SHA-1: 7dad9a5ad404ab309efd3b274c6232274ee5a912 SHA-256: 9f0af8ce3ea8f62082370036726e54b71048c7a598d85ffc3154e05293fa95b1
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free Robux generator" which redirects to known malicious infrastructure. The malformed stream length and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF's nature suggests it may contain embedded JavaScript for redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-generator-no-download-or-survey-game-hack In PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/free-robux-promotions_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/hacks-to-fly-in-roblox_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-account-without-email-and-password_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/how-do-you-get-a-free-dominus-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/free-robux-with-only-username_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/roblox-god-mode-hack-2021_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/free-robux-and-tickets_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/how-to-find-free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/the-northern-frontier-roblox-cheater_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/hack-two-factor-authentication-roblox_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/roblox-dino-toy-codes-free_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/roblox-com-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/a-code-for-free-robux-script_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/roblox-com-free4mobile24-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/dbor-roblox-level-hack_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/rewards-robux-free_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/hacks-de-roblox-para-conseguir-robux_GM431946152.pdfIn PDF document text
    • http://sman1tembuku.sch.id/new/public/ckfinder/userfiles/files/games-that-actually-give-you-free-robux-2021_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_off0000315e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x315E 22024 bytes
SHA-256: d5c8fc9854442f6dc78f9f34215ca456f098208dede8a80653107c25b876d47f
font_01_sfnt_off000061f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F9 19692 bytes
SHA-256: b7a5a32863ed1f26de9e1b065d94155e2d29dbd80105084975e601eb4a983275

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