Malicious PDF — malware analysis report

Static analysis result for SHA-256 6465e3b00e3bd25c…

MALICIOUS

PDF

44.9 KB Created: 2020-08-30 18:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8830229dd3f7e4a21e1f1b258280ca30 SHA-1: e8339450a0365455f99f4337336b6168659872f5 SHA-256: 6465e3b00e3bd25c7628f3dfe10b36385c5e75a2ca88b4d2791228508260df3a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/wix?keyword=elite+dangerous+how+to+land+on+plane, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. 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.cc/wix?keyword=elite+dangerous+how+to+land+on+plane
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/84777787134.pdf
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/93098557415.pdf
    • https://cdn.shopify.com/s/files/1/0434/4843/4840/files/jozowaf.pdf
    • https://cdn.shopify.com/s/files/1/0439/4529/6027/files/carrom_game_rules.pdf
    • https://static.usrfiles.com/ugd/e42ee3_6174683934b94bffa2c42635806a68af.pdf
    • https://static.usrfiles.com/ugd/b8c837_016fe89a5c6f48dd88ed8aa3cbc97484.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ea50097fd1344778fc09c232cb3b066.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6dc46405b074502859cef609ce0d915.pdf
    • https://static.usrfiles.com/ugd/a18aa6_f7b11fc76f73495ea9e1df9c0edd714c.pdf
    • https://static.usrfiles.com/ugd/b8c837_66510327cdb34ea39dd840bf1933f4ff.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007111.bin
65ea2e5a5db749a7e3ded1dde139ff19aab276ab0e2a3a51a14314303f712956
pdf-font-stream PDF embedded font (sfnt) at offset 0x7111 5268 bytes
font_01_sfnt_off00008301.bin
ee1aafe55d1de64e669b602e1eb6b281013e8e27e6ddd76fab535bd505285773
pdf-font-stream PDF embedded font (sfnt) at offset 0x8301 10472 bytes