Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac536ad51af61f1…

MALICIOUS

PDF

50.0 KB Created: 2020-09-03 04:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d17e137e88e257b7300456f9fba2b423 SHA-1: 0435468162d696cfd2610d68dc7c0a2772b085e7 SHA-256: 7ac536ad51af61f1def19b4d7191b62479516e8e572e259990693187192b1778
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-optimized and lead to potentially malicious redirector infrastructure. The primary malicious link identified is https://ttraff.ru/wix?keyword=attire+for+wedding+formal, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to lure users to malicious sites under the guise of relevant search results.

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=attire+for+wedding+formal
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/ec0012_905847f4e6ea4fbd8499cad3071e92e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bb815f7052643ddb9520f07d89f548e.pdf
    • https://static.usrfiles.com/ugd/99afdc_69789529f56f412596742d24692c8967.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/xupodafaxifimomen.pdf
    • https://cdn.shopify.com/s/files/1/0430/8896/9882/files/13916298108.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/2866554169.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/lidivujisatapod.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/paxazisojuw.pdf
    • https://cdn.shopify.com/s/files/1/0464/7560/8214/files/angular_template_free.pdf
    • https://static.usrfiles.com/ugd/ad8f3a_193aa4dfa3384c8a879396fc1b03a3c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_984bf8d94af944ab80c531d3613b8fc5.pdf
    • https://static.usrfiles.com/ugd/09273f_3db4b5e06cd04b828a6164433f7ef150.pdf
    • https://static.usrfiles.com/ugd/15ebe2_022fb717f681467ba5c0e1581fba9f8d.pdf
    • https://static.usrfiles.com/ugd/6da380_1a4aa69c069d4c4cbc64d332de5c3b4c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078f0.bin
9cb8130c0912cc050afca4eda736a57e82d3f3d502d963630aa0fc3d2c047beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F0 4920 bytes
font_01_sfnt_off0000899b.bin
da69c19374ee885bf354faec5c0814b75393b831ef0efc7cabeaa9aec9ec5f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899B 10392 bytes
font_02_sfnt_off0000ad1e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1E 4324 bytes

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