Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a295d3fc33ca58…

MALICIOUS

PDF

44.8 KB Created: 2021-05-13 11:32:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 730875e818e166472109cd4f2f152e24 SHA-1: 1aba0162df6f2fb472e625fc39c53d274e4ccd68 SHA-256: 40a295d3fc33ca58249783a5910c990fb084d59ea703b5f6f7a6984f40f823d3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, specifically promoting 'game hacks' and 'free generators' for popular games. The document body and heuristics indicate a lure to download further malicious content, likely a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/como-hackear-coin-master-game-hack In PDF document text
    • http://apx-centre.ru/images/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-android_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-verification_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-app_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004901.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4901 25032 bytes
SHA-256: d7d8b2f7e038f0fbddf4cc0757ab27d4d30e449554366d4330c324e0d9768b45
font_01_sfnt_off00008231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8231 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5A 17976 bytes
SHA-256: 40dd236b971f40dc9e773aba28db4bcf9d666fe41fb73238afdc269e45a8876b

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