Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e675746e59d21b…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 18:43:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 83ad3d9b85b4af4e9bbc71ff36612b03 SHA-1: ef8020bb05db40612852ec4380114d2847941f7d SHA-256: f8e675746e59d21b51bb3afc249030aa4c1691b01d843b363e0c076d6f6fffe8
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The document contains multiple embedded URLs and a prominent external URI pointing to sites offering game hacks, specifically for Roblox. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or distributing malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.tw/app/431946152/free-robux-hack-us-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-de-roblox-admin-descargar_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/pubg-uc-official-price_GM1330123889.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/medieval-hood-roblox-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-in-roblox-prison-life-v20_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/best-hacking-websites-for-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/pokemon-go-free-meltan-box_GM1094591345.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-bee-swarm-simulator-hack-games_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-sprint-simulator_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-download-roblox-apoc-hacks_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-roblox-accounts-using-inspect-element-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-automatic-human-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coins-master-hacks_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-roblox-high-school-2_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-sites-2021_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_off000032b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B0 22388 bytes
SHA-256: 116bbc35b4fcf81b7dadd09987b1f6e18ee7469c933480da31841abe184b7739
font_01_sfnt_off00006467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6467 18884 bytes
SHA-256: bfc674629a4fdfc233a3c1a19cbee54387e60bd0cdfc4a3107778b42d9fa82d8

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