Malicious PDF — malware analysis report

Static analysis result for SHA-256 16454ab98f818eb3…

MALICIOUS

PDF

34.1 KB Created: 2021-06-18 13:59:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1737acdd505bb39baaa0a11a465fd22e SHA-1: e4e2a7508f33e0887ddbb1b853cf22824238d92d SHA-256: 16454ab98f818eb37843507d09454ec5ed7274074ed362566bb7dbfaa2746a9f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links to known malicious redirectors and lures users with promises of free in-game currency and hacks. The malformed stream length and ML classifier indicate a high likelihood of malicious intent. The document body and embedded URLs suggest a scam designed to trick users into visiting potentially harmful websites.

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.co/app/431946152/free-robux-link-game-by-roblox-game-hack In PDF document text
    • http://medinup.pt/images/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/pubg-uc-hack-season-9_GM1330123889.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/20210-robux-free-scam_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/how-to-get-robux-for-free-100pasant-works_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/how-to-lvl-hack-in-naruto-final-bond-in-roblox_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/baby-simulator-hack-roblox_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/roblox-play-for-free-without-downloading_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/hack-for-roblox-project-pokemon_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_off00002d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D40 22488 bytes
SHA-256: 8e685db2760709c198d6357fa1408adb80fcf5c3deca1a7ef28517b5c568bfa4
font_01_sfnt_off00005f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8A 19336 bytes
SHA-256: 668ca685dc1482d82d53d7a9663c262f6cdee386f830b359d10ae9b8ea08d69d

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