Malicious PDF — malware analysis report

Static analysis result for SHA-256 29493a639c105dbe…

MALICIOUS

PDF

35.3 KB Created: 2020-08-31 08:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96e83490696e7c59e7e24fba3bcce015 SHA-1: 0ac8cfd04dcfc7b88ae8249ab36b576477f156f7 SHA-256: 29493a639c105dbe32697db82a1790b5bdf805d10eae979bb3d53ef7e1d84b52
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/wix?keyword=segel+enzyme+kinetics+pdf+download`. This URL is likely used to redirect users to malicious content. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to `cdn.shopify.com` and `static.usrfiles.com`, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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=segel+enzyme+kinetics+pdf+download
    • https://static.usrfiles.com/ugd/ae059d_a0efa1368a6c4ef8afaad396d36cd5fa.pdf
    • https://static.usrfiles.com/ugd/33a16d_c914a62fcb0440598c62c0972291ba25.pdf
    • https://static.usrfiles.com/ugd/565485_ec02cc16e2c2452984f338fa6145c71d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e11e319da3e944ceb21665370faddd39.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3390/files/topopel.pdf
    • https://cdn.shopify.com/s/files/1/0465/2426/8702/files/4453674326.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/38754693915.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/bobsweep_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/chiedere_in_inglese_formale.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3345/files/wukusez.pdf
    • https://cdn.shopify.com/s/files/1/0431/5919/1706/files/dawikonijuzil.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/siwofosagubuwukewirakol.pdf
    • https://cdn.shopify.com/s/files/1/0428/5274/5375/files/xigetikolesuxipifogenido.pdf
    • https://cdn.shopify.com/s/files/1/0428/9921/0407/files/suveguvunurezepuze.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b56.bin
073afdec9115e70991110ac33b3ed956e8fc8ae62e75d9796368d89a026d4669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B56 5788 bytes
font_01_sfnt_off00005f25.bin
ea6854da729efc8b595af9434ae8048618c08cdd81914090293fb4f969a980ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F25 9828 bytes

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