Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7aa1d29232a5dcc…

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 12:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18e5b02640499cd274e9eb6e98699ea6 SHA-1: ef60a177db37dffa38d803c79f835c1235d7c592 SHA-256: e7aa1d29232a5dcc0472e52fab6e64fa17de8397601467f2a6c3a789e54ae32f
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=centerpoint+rimfire+3-9x32+mil-dot'. This indicates the document's primary purpose is to redirect users to a potentially harmful destination. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of the malicious URL and the SEO link farm heuristic suggest a delivery mechanism for further malicious activity.

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.ru/wix?keyword=centerpoint+rimfire+3-9x32+mil-dot
    • https://static.usrfiles.com/ugd/b8c837_f2c2396210724176abdfc9fe94180e7e.pdf
    • https://static.usrfiles.com/ugd/913720_aaa2dd217e9840c295325be4c160a4ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_73bd2cffd2074b3da95b4760d81bd000.pdf
    • https://static.usrfiles.com/ugd/764aaa_3d1894e7666b42f981da420edc6c79bb.pdf
    • https://static.usrfiles.com/ugd/696b8a_aeab78dc1d5644cfb4ef66026fd819db.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/91153722138.pdf
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/fusesezofegaxumek.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/inglourious_basterds_2009_movie.pdf
    • https://cdn.shopify.com/s/files/1/0437/6631/7205/files/bankers_adda_ibps_clerk_mock_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/nomiwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7978/4866/files/email_format_for_applying_maternity_leave.pdf
    • https://static.usrfiles.com/ugd/45e30f_de801a1df71342ea94711e3a56b83c32.pdf
    • https://static.usrfiles.com/ugd/2ca22b_7a3dc49ec5014f2fa76f5609309780da.pdf
    • https://static.usrfiles.com/ugd/345929_51903153b3954dd8927b46ef74f3dc11.pdf
    • https://static.usrfiles.com/ugd/f0e51d_b32e590810ee49169e0a5a166990992c.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_off000061b1.bin
e2364a219ae725c1ce18ac8033eb1be877b011b0aa780c88a8983a318e929e5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x61B1 5256 bytes
font_01_sfnt_off00007382.bin
eb61ca26fa73ce28da7dde92134206ece53e792f6c722cb69308af5d01dde424
pdf-font-stream PDF embedded font (sfnt) at offset 0x7382 10864 bytes