Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1ef4ee73cb95fa…

MALICIOUS

PDF

55.8 KB Created: 2020-08-28 22:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78b43130615deb5cd9a292504a0afbbd SHA-1: 6f07f2efe308e6d7fb4f149f974aa5e256282fe9 SHA-256: db1ef4ee73cb95fae472539a40dda3d45acbee993e2ca3f63af4a783883c2175
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a download button, intended to lure the user to a malicious site. The document body, though heavily obfuscated, contains the same malicious URL. The presence of a link farm further suggests an attempt to manipulate search engine results or distribute malicious content broadly. No scripts were extracted from this sample.

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://ttraff.cc/wix?keyword=arm+microcontroller+programming+tuto
    • https://static.usrfiles.com/ugd/b8c837_e62dca9eb4164cc580e4e8856dd25dcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e14e57d5b084f45bf420dce094d6a1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_20de3a8b3a7c429c996668ffc80d8e8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_84afb516428d45e69379c618e354cae9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9842a2897bf4bdc9bb74fe7f8ce7dda.pdf
    • https://static.usrfiles.com/ugd/b8c837_255a84215a284ca88d45dcb08a210a2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_de08946a9d27462793c77bec0e9c467d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2be55c7e8b444c1fa019757a913632e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_72a36348727c4e4a8f130218f187521d.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/15611093487.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/tesco_questionnaire_answers_2018.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007680.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7680 6744 bytes
font_01_sfnt_off00008765.bin
d51b116dcff8a3ea3bb1ff50341cb837a3478c76ed25b399d4e1498f41b0f8e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8765 5064 bytes
font_02_sfnt_off0000987f.bin
242802b3db265742eddd680bf87d79783f6ab7d6e90e910d833f47964169f420		 pdf-font-stream PDF embedded font (sfnt) at offset 0x987F 10472 bytes
font_03_sfnt_off0000bc8f.bin
b513542a744b4fdf5a1b40238c2149fd983d9a21f692e71aa951ffcc8729fe48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8F 16176 bytes

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