Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cadca4ab831b1c…

MALICIOUS

PDF

42.4 KB Created: 2021-05-16 01:06:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 02e5b4edca142a945334f4484bae6a3b SHA-1: c81ae5f838548dbba1d4d0ffe59663ffb88a94f4 SHA-256: f8cadca4ab831b1c50f819f4bcb2fbcb4e983eb6373a2dbcaa9c3a633a9802b6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator' or 'game hack' lures related to popular games like Roblox and Coin Master. The document body and extracted URLs strongly suggest a phishing or scam attempt designed to drive traffic to potentially malicious sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious workflow.

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/431946152/roblox-place-rewards-game-hack In PDF document text
    • http://i-koinoxrista.gr/images/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/roblox-18_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/robux-page_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/coinmasterfree_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_off00004a1d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1D 24572 bytes
SHA-256: 5020048e8a6fcf366500018c8e300ff25ea9771c0c75d31ca7a228a2e736e055
font_01_sfnt_off0000826a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x826A 18504 bytes
SHA-256: a91422b40b1f0e9b25312e0f225173307c9cda4ba1c84b6eb7c88c6311770e07

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