Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae96236a351fc1c…

MALICIOUS

PDF

42.4 KB Created: 2020-08-31 02:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dd744f6488abe691f2ac201f0b0918b SHA-1: 06b35694671c4d0f15d5936b90f4478ec0251088 SHA-256: 8ae96236a351fc1c11efdf35d5cc59f694b4e0f488cb27c66b11e25a46330135
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.ru/wix?keyword=revoke+the+privilegia, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other benign-looking URLs, suggesting a lure to a malicious site. 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.ru/wix?keyword=revoke+the+privilegia
    • https://static.usrfiles.com/ugd/ee4a13_c7d70e19e8e44e6bbefe852175a02c0e.pdf
    • https://static.usrfiles.com/ugd/07625c_b209ed33e0264e079b3755dd2f79f786.pdf
    • https://static.usrfiles.com/ugd/b8c837_0112edbed89145b9be46dabcb3dd0050.pdf
    • https://static.usrfiles.com/ugd/b8c837_791fd0c048c3440aaea525b831fe53db.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7603f3b730b4ec0a5627ef94f09ea5f.pdf
    • https://static.usrfiles.com/ugd/32acb1_51ab3da2f9184ce4a9545c540480da99.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_203e37c03f0e4010abd5977d3cc72053.pdf
    • https://cdn.shopify.com/s/files/1/0459/8824/9757/files/la_batalla_en_el_desierto.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/jokiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/the_bourne_legacy_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/6662309944.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_off000067e3.bin
f17409f94f6532b26cb3307f7d57210219fe99d253ff99463ed2273fa080c910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E3 5036 bytes
font_01_sfnt_off0000790a.bin
e8b210dc4d16e224f0cc8665795ee913a7014333aa3dab9f6729504bb8d8b5c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790A 10644 bytes

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