Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9adf489fe1b374…

MALICIOUS

PDF

38.4 KB Created: 2021-05-30 01:28:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4e860f9ebed320c40cc5465b58b4b573 SHA-1: 84f42f28fe9ccaaa42b1f62aa7205e8f2f00da8a SHA-256: 8c9adf489fe1b3748c2b419c91176148d0cc2cb9957b403ecc4d729ed1e48101
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, specifically promoting 'free generators' or 'game hacks' for popular games like Minecraft and Robux. The document body includes a call-to-action phrase and embedded URLs that lead to these malicious sites. This indicates a social engineering lure designed to trick users into visiting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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/479516143/minecraft-apk-free-download-game-hack In PDF document text
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/minecraft-free-app_GM479516143.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_002_off00003a33.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3A33 25512 bytes
SHA-256: 8c3ec76ee6c42a9c93242a86b785b28b615b84e401fb1d9fc46b9dd4cb52ad38
font_01_sfnt_off000073a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A6 18636 bytes
SHA-256: 460052af6c2621f53863fdd0e184641c8149664fef9b3bc68df6f3fcb4cff320