Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5b438804a6e461…

MALICIOUS

PDF

62.4 KB Created: 2020-08-28 20:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e871e5f1ae34abd759bbb072c42ebdd SHA-1: 8a41123ee1c64b6738327e84704b064cc4b484ed SHA-256: ec5b438804a6e4615363fb931472f6135471548174a30282c7f045e8cf5f7d8c
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm, with one prominent URL pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the link farm heuristic, suggesting the primary intent is to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/wix?keyword=much+ado+about+nothing+analysis+pdf
    • https://cdn.shopify.com/s/files/1/0434/2530/0629/files/canalys_smart_speaker.pdf
    • https://cdn.shopify.com/s/files/1/0433/3128/9256/files/86935400927.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1277/files/tevuwujejobazanawamu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/xumadigapovolut.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/singular_and_plural_nouns_worksheet_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0429/3571/3958/files/jilub.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/using_commas_in_a_series_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/31701819538.pdf
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/86028233887.pdf
    • https://static.usrfiles.com/ugd/b8c837_dccc252bc9b54ef0aefd27ea420dbcd8.pdf
    • https://static.usrfiles.com/ugd/b8c837_8706d0520cde4725995667a63ef28ff4.pdf
    • https://static.usrfiles.com/ugd/b8c837_447a6753bb234add81661ee07112d95c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c84bc509c82e4486b3a31c1d0b4ac0c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_676b10df6a5a49e8b9d0f0192a7b4ade.pdf
    • https://cdn.shopify.com/s/files/1/0464/1069/4824/files/foxhole_radio_backpack.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/sql_server_stored_procedure_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/46345000365.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_off0000b651.bin
210fd289cd7b6456006d857c5a76b91af8fbd578ec78e511712671181b393d78
pdf-font-stream PDF embedded font (sfnt) at offset 0xB651 5568 bytes
font_01_sfnt_off0000c94e.bin
fe6afcb91e452898ea83ce4238308ce037cf8dfae46b74be7ac9b4ee9098e150
pdf-font-stream PDF embedded font (sfnt) at offset 0xC94E 10200 bytes