Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b6543ee85e2858…

MALICIOUS

PDF

41.5 KB Created: 2021-05-13 04:12:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5c6d48e434e0c17397037dd9e8de6ff8 SHA-1: 99726a2f2d866d59b39c4021abb96b87bc3ae7c7 SHA-256: d7b6543ee85e2858acf0d0faadcafb4e697bac4006718aa7a62369ebc8e806b9
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that impersonate the Microsoft brand, luring users with promises of game hacks and generators. These links redirect to malicious infrastructure, specifically `https://netcdn.xyz/app/479516143/minecraft-hack-2021-game-hack`, indicating a credential phishing or malware distribution attempt. The document body contains obfuscated text and metadata suggesting it was generated by `wkhtmltopdf`, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/479516143/minecraft-hack-2021-game-hack.
  • 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/479516143/minecraft-hack-2021-game-hack In PDF document text
    • http://solidkom.ch/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/earn-robux-websites_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • https://sigmaclient.info#2In PDF document text
    • https://flux.today#3In 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_off000048b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B8 24292 bytes
SHA-256: 5b2730159e9dc44c7ffdc83801b555aba374d0bb2c2ff8f2d5256f06701513fd
font_01_sfnt_off0000801d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x801D 18140 bytes
SHA-256: c4871d7a9fac3ab188a2e56e86996e0c49dc42d21a9daf4a9eb4f35130b88c58

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