Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13d03d03d9fb36a…

MALICIOUS

PDF

41.5 KB Created: 2021-05-17 03:34:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3e6d0a3eafdd66ff0db9be8eefb11f00 SHA-1: 5313994f4863f534c06f4fb3d065788a2f107edd SHA-256: a13d03d03d9fb36a2ffd81051350d21e12248a4bfce3ebef08cea2d012e2ad42
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one pointing to known malicious redirector infrastructure at `https://netcdn.xyz/app/406889139/coin-master-free-spin-and-coins-links-home-game-hack`. The document body and embedded URLs suggest a lure for game-related cheats or currency, likely intended to lead users to a phishing or malware download site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-free-spin-and-coins-links-home-game-hack In PDF document text
    • http://www.centralbarbershop.ru/images/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/free-robux-now_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/robux-premium_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/robux-giver_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/coin-mster-free_GM406889139.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
stream_003_off000047bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BF 24376 bytes
SHA-256: 6eea1233026a1bd7d87a35bce649822abca18cf65fdcd33dde09416998e4259e
font_01_sfnt_off00007f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4B 18492 bytes
SHA-256: c6f1255b5246b10a2381080087e328848ca3d63cb104c3d5d5a1d34eeed5229c

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