Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d28c44c20756b4…

MALICIOUS

PDF

42.9 KB Created: 2021-05-12 20:18:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b53dff2b726d35a58200cc01e700c2b7 SHA-1: 98c119157aaa6325054053c0adc578cf29fa3b4d SHA-256: 63d28c44c20756b43c4567bb30b4b4d48c51a883a600a7fc32e804c4b66004af
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the document as malicious with high confidence. The presence of a visual download button suggests a lure to trick users into clicking the malicious link, which likely leads to malware download or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 3

  • 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/robuxmatch.con-game-hack In PDF document text
    • http://e-mailservis.cz/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://e-mailservis.cz/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/optifine-mcpe_GM479516143.pdfIn PDF document text
    • http://e-mailservis.cz/images/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/completed-coin-master-hack_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_off000048ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48CE 25848 bytes
SHA-256: efd9f31bbbe981ed34e9fa70dbf3d4ee7ab8381c2ff0ec1222ef3670595cb1f3
font_01_sfnt_off00008420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8420 18672 bytes
SHA-256: b3ad435d94df059fa4f5f4039152be4ff635e0c8c599297d8dd6c4123da1a60e