Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d64d1e58821258b…

MALICIOUS

PDF

40.7 KB Created: 2020-09-02 13:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c19dbc5ef5f248280a5c54e31ace495d SHA-1: 1176bdbbefae0ea8a823461970f6feff233bc58b SHA-256: 9d64d1e58821258bae381eb93fc97d8731f63f8f70b54da312c522e45b20a9b4
150 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, a common technique for SEO poisoning and redirecting users to malicious sites. The primary link identified, https://ttraff.ru/wix?keyword=language+arts+worksheets+for+4th+grade, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing the intent to direct users to potentially harmful content under the guise of educational worksheets.

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.ru/wix?keyword=language+arts+worksheets+for+4th+grade
    • https://cdn.shopify.com/s/files/1/0438/1986/0125/files/have_fun_teaching_alphabet_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/73617134920.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/siditodevude.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/xuvapufuvegetapaxen.pdf
    • https://static.usrfiles.com/ugd/a4d998_5acd090f864249b7a3377b70a993f112.pdf
    • https://static.usrfiles.com/ugd/10e3af_3abcaf2525594797bbbc4b13f41647db.pdf
    • https://static.usrfiles.com/ugd/e4ff69_ad3f5e0dea7a44a9ab1544711c6b6505.pdf
    • https://cdn.shopify.com/s/files/1/0446/6681/4617/files/transtorno_borderline_livro.pdf
    • https://cdn.shopify.com/s/files/1/0431/5109/8007/files/la_perla_secreta_mary_balogh_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0462/7093/9285/files/zelogabogazifijedo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/epic_simile_definition.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_off00006293.bin
0670303216e733713580d06253470357b194ace9c8cafd85e049248f54595cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6293 5324 bytes
font_01_sfnt_off000074c6.bin
7dcc039609713d571f756ceb8cc69f87d5987c1522f1bb7dc569972dc4443b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C6 9840 bytes

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