Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d8d848f66c9d5b…

MALICIOUS

PDF

44.4 KB Created: 2020-09-04 20:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b0181fdad1fec296d3b7d0120870bb2 SHA-1: 766f90ad35e751df2a598fa3061c35cd4c17ee93 SHA-256: 34d8d848f66c9d5ba9e4d47b530c621bb54debcbdcd887b1cc6a78c1a51d2a58
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 'ttraff.club'. This URL is presented within the document body, disguised as a link related to 'worksheets for esl students beginners pdf'. The presence of a large number of external PDF links, many hosted on Shopify, further suggests a link farm or SEO poisoning tactic to distribute malicious 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.club/wix?keyword=worksheets+for+esl+students+beginners+pdf
    • https://static.usrfiles.com/ugd/d775a9_4919ba66ed3c4a76bc431cab150e7a5d.pdf
    • https://static.usrfiles.com/ugd/e745be_e6a1753bab844054ae5a09ca1f50d720.pdf
    • https://static.usrfiles.com/ugd/f65175_f9b3583749dd4fddbd715a08b65261ef.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1464/files/answer_to_life_is_42_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0438/1753/3597/files/tofipoburim.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/kebowez.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/62599432531.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6490/files/anyplace_remote_control_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0016/files/html_css_javascript_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/jolelulapugomipidamivuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9538/3446/files/dofawotofadarulosof.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2404/files/boxuxarodenoje.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/42565365664.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_off00006fcc.bin
ff809c3e6aa6004844c8e64339ced13056156f0165100a7fc0d6cde4500f9f21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCC 5312 bytes
font_01_sfnt_off000081e3.bin
7f9b70452dc169e58ea62171938f1c7ca49c7d89d569ad7f08e36af487592157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E3 10256 bytes

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