Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f5291bf120fe25…

MALICIOUS

PDF

42.1 KB Created: 2021-05-14 14:10:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 847f373c204b206360a6c6c01c702fd3 SHA-1: 90b70a76374c3a94ed115763c0c393f86680d646 SHA-256: f1f5291bf120fe25103424464149544c2d057fa6b25961fd9829d2117cdaebd5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains, specifically advertising 'free generators' and 'game hacks' for popular games. The primary link, https://netcdn.xyz/app/406889139/coin-master-free-spins-link-2021-hack-game-hack, is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a lure to download further malicious content, likely exploiting the user's interest in free in-game items.

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-spins-link-2021-hack-game-hack In PDF document text
    • http://stroygrad-spb.com/images/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/how-to-get-free-robux-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
stream_003_off00004865.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4865 25028 bytes
SHA-256: 2f4827b408b064a56f76d52b03f876024c2ed73c062d941c19b421a02e80442a
font_01_sfnt_off000081a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A6 18456 bytes
SHA-256: cd0dac1e42acf1dd8fac6ba5781826c7c26695a9ef6d84d4a0ecdd405406f8c6

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