Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0900777ca7f1ff…

MALICIOUS

PDF

45.2 KB Created: 2021-05-14 12:33:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: fbb8371bd5827b44128ac3be6d695d72 SHA-1: df77ce09edbc188f42d23c4a38e058a55b3bdfdc SHA-256: 3b0900777ca7f1ff56271c288bf8edf8b93ae85dc8e06656fbb8376b6d825e18
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with the promise of 'free Robux' or 'game hacks'. The primary link, https://netcdn.xyz/app/431946152/get-free-robux-com-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/get-free-robux-com-game-hack In PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/robux-prices_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/roblox-points_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/minecraft-116-free-download_GM479516143.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-premium-roblox_GM431946152.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_off00004ca9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CA9 29620 bytes
SHA-256: e85461579b36a3190d37785b8fa03f837e9ba09141f9e51060e15c9e1f8c43cb
font_01_sfnt_off00008e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4A 18376 bytes
SHA-256: 2d8882c6a342abc4889e46f94bfee9f8cbf5538b2f5dc41d172000db9622f481

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