Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3935c41aaf761a…

MALICIOUS

PDF

41.9 KB Created: 2021-05-12 13:52:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f664c8dbc5efa6452ef718f5f593572c SHA-1: cc5a857db4aa7ea6a4d04203a4d20f7bc9dc737b SHA-256: 5b3935c41aaf761aafea16e70541a9eb0a35aa6b61d9df15aaf7c8241ff21400
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link to known malicious redirector infrastructure, which is designed to deliver a payload. The presence of a visual download button and embedded URLs further supports the malicious intent. The ML classifier also flagged this PDF with high confidence, indicating a malicious document.

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/479516143/wurst-client-1.8-9-game-hack In PDF document text
    • http://pisanie-nut.pl/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://pisanie-nut.pl/images/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/free-robux-app_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/minecraft-free-download-no-virus_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_003_off00004925.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4925 24612 bytes
SHA-256: 26c3467a5a6ab76da0478a192ff25565e994368666e6653f7d18fd4584ce08a9
font_01_sfnt_off0000816c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x816C 18296 bytes
SHA-256: 4d8ada0c5ac659fb49370babfb0317bee460cb2310b474ce078588896e89c849