Malicious PDF — malware analysis report

Static analysis result for SHA-256 259176d7b20aa543…

MALICIOUS

PDF

38.6 KB Created: 2020-08-15 15:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92cd6ca577f291c1dad31147a41e8968 SHA-1: 9c84fbd5a0d06eb77a813fbb1b52e79281c214ae SHA-256: 259176d7b20aa543c7444d441ceccf11f6cec76d67b7f179f18a173efb1fe2db
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external links, with one critical heuristic identifying a malicious redirector. The document body, though malformed, contains text related to a 'worksheet' and the malicious URL, suggesting a lure to trick users into clicking the link. The primary malicious URL is https://ttraff.cc/wb?keyword=suffix%20ness%20worksheet%204th%20grade, which likely serves as a gateway to further malicious content. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/wb?keyword=suffix%20ness%20worksheet%204th%20grade
    • http://files.piedmontlandscape.org/uploads/1/3/1/4/131453648/92343075.pdf
    • http://files.learningforcharity.ca/uploads/1/3/1/4/131452735/3011405.pdf
    • https://cdn.shopify.com/s/files/1/0431/1010/5255/files/bupejelov.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/kiralite.pdf
    • https://cdn.shopify.com/s/files/1/0443/0469/5452/files/bnf_75_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1297/9869/files/rixutob.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/linguistic_typology_morphology_and_syntax.pdf
    • https://cdn.shopify.com/s/files/1/0435/6967/6451/files/82496323592.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/foniropugaboxivadolikijip.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/sinifi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/zunesilinukozejoxi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b7c.bin
01370a2f80a3c86abaa209c5d5034dbc53f044e8944f28b31258ecaf2c0b900e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B7C 5436 bytes
font_01_sfnt_off00005e05.bin
5f547e739b99e1445a157c605622c6177aaecb46477e0e32ce0a82faacd9134f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E05 9852 bytes
font_02_sfnt_off00007fd4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD4 4324 bytes

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