Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b513db5fb62d85…

MALICIOUS

PDF

44.1 KB Created: 2021-06-07 18:39:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: dbf474b62eda459a57e6814ed7f57460 SHA-1: 086d13a3536fa15cefec8ee2f3b5ffd0308f675b SHA-256: 03b513db5fb62d8587c7dacf7e81977b59398a2d63f68f7b7ffc51cd9c45ad21
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on a domain commonly associated with SEO link farms. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to game hacks and includes URLs that likely lead to phishing or malware download sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/hack-site-roblox.com-robuzx-game-hack In PDF document text
    • http://kulturlandschaften.eu/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/wurst_GM479516143.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/free-robux-generator-with-chat_GM431946152.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/coin-master-how-to-get-japan-sushi-card-free_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_004_off00004fa4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FA4 24356 bytes
SHA-256: 48893516d6477806cfac11d26269103d19d079b68c9afe2a1fc661d9320c6130
font_01_sfnt_off00008779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8779 18956 bytes
SHA-256: 6ad50d9e84250d13e49654c130b700f31a445333de4915c3aef594ef6b1b1e77

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