Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f28a4a1cc0e255f…

MALICIOUS

PDF

53.6 KB Created: 2020-09-07 16:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5581257ad8e4543d677a17616af0826 SHA-1: 382969baa4a6f3e78c6100c5529b57cb950a1aac SHA-256: 5f28a4a1cc0e255f574a32497194bd8bcaf07047a62d68613c02de6517c57860
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=canyon+de+colca+2+jours+sans+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/43d598_63cb03f5ea3748d784cb4ce8e135771a.pdf
    • https://static.usrfiles.com/ugd/4a6c57_7d5078e6e40c4f7fbe3620192df7f18a.pdf
    • https://static.usrfiles.com/ugd/3f8d85_486ed9c9bbc9463ca67ffccd243d98ac.pdf
    • https://static.usrfiles.com/ugd/c7a620_64e7ac32ff884c09afbcaa1790e99aec.pdf
    • https://static.usrfiles.com/ugd/de02f3_a460c3049d114250a6fd32ac5e6cd43f.pdf
    • https://static.usrfiles.com/ugd/b81754_e0727b7179cf40ebac70b7ac2e8197f9.pdf
    • https://static.usrfiles.com/ugd/2ca09c_ed1f981575694fc2b15710c98084ff54.pdf
    • https://static.usrfiles.com/ugd/c75f60_0ceee7d5bf2c4abeb92ffdbde2243e0b.pdf
    • https://static.usrfiles.com/ugd/599026_2d7f3559a1684f96b2f75a44584947e5.pdf
    • https://static.usrfiles.com/ugd/bdc04d_0dfb5f61bb814ccd80f80389a2a1369c.pdf
    • https://static.usrfiles.com/ugd/05301a_c6d5f4e481b74514ada1928e832c2024.pdf
    • https://static.usrfiles.com/ugd/d4579c_39d476a7f5f640d99a1bd47853c6d7b7.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079e6.bin
de8130e4c2517af7ae9814c5d44e320394cfe8d3bcfc237885d0829ea2a31cc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x79E6 5320 bytes
font_01_sfnt_off00008c1c.bin
531025198719737257580122b5b993414ce3f579a1e2498c1c77b1b78335372b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1C 12308 bytes
font_02_sfnt_off0000b24a.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
pdf-font-stream PDF embedded font (sfnt) at offset 0xB24A 16312 bytes