Malicious PDF — malware analysis report

Static analysis result for SHA-256 762f9d557aa6da3a…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 18:28:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e8ecf2b3e5ee74cad8579a0b00fd6b67 SHA-1: 29928f08535485a153ebb08e67d65fd332be9b97 SHA-256: 762f9d557aa6da3a9e1a0b2cc6bc6643110cbab903c2c77091a173bbd65c0652
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/free-roblox-clothes-boy-game-hack. This URL is presented as a lure for a "free generator / game hack". The document body also contains this URL and other related links, reinforcing the phishing attempt. The ML classifier also strongly flagged this PDF as malicious.

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.tw/app/431946152/free-roblox-clothes-boy-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/albertsstuff-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-and-tix-without-hacking_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-4-mobile-24-com-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/win-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-coins-in-roblox-pet-simulator_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-jump-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-free-download-ps3_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/op-rewards-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/apps-on-that-can-hack-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-to-have-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/rbxnow-gg-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_off00002d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D52 22368 bytes
SHA-256: 6897488326f251f7bb94e53e6a6eebb554e6033a49699cd275c0ee88dd7902ec
font_01_sfnt_off00005f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0F 19100 bytes
SHA-256: 28341dbcda454e7340ab8e334eac74836881bfaf0e9a0fabd5c9f748827b7a34

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