Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b0871d18fa33d6…

MALICIOUS

PDF

50.2 KB Created: 2021-06-13 21:58:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 27e64c743e13a89a82fb5971a1e8989e SHA-1: 7a8e5a01f53cc796870d33f0aba85780c3a878c4 SHA-256: 71b0871d18fa33d60906154626293d82f500cc62f838819aafd176e540542ab3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a URL that is also flagged as a malicious redirector. The document body, though partially corrupted, contains text related to 'free generator / game hack' and a URL that aligns with the heuristic findings. The presence of embedded URLs and the nature of the lure suggest an attempt to redirect the user to a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.co/app/431946152/how-to-get-badges-free-in-roblox-game-hack In PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-studio-create-a-cheat-code_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-robux-with-no-verification_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
stream_003_off00004a34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A34 39428 bytes
SHA-256: 91ca0169b16bd7a71d97bbf94c640f4d2323ba1f4e21ffdc5e9425f6e2074afb
font_01_sfnt_off0000a062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA062 18908 bytes
SHA-256: 0016eafc8e833b4af648a0c234833ba7bd288e62b8b9b1d3fd3d987f614f9a0c

Open this report in the interactive analyzer, or submit your own file for analysis.