Malicious PDF — malware analysis report

Static analysis result for SHA-256 81173332ae2ee6a7…

MALICIOUS

PDF

47.2 KB Created: 2020-08-15 07:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18df5412c5a4c41cc8db58385361bbf6 SHA-1: acc167a5423756e03e024802d8506f93d7e77f04 SHA-256: 81173332ae2ee6a7e80420c2550a17e083d3284fbbaa70f79cbb8e683a789e85
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text suggesting a lure related to memorial donations and includes the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are benign but likely serve to obscure the malicious redirector. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users.

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.com/pify?keyword=memorial+donation+thank+you+letter+template
    • http://files.americanlandcorporation.com/uploads/1/3/0/7/130775361/8057430.pdf
    • http://pedubon.livingwordhouma.com/uploads/1/3/1/4/131407588/wazazerojew-jatarudasepib-sitaruvumez.pdf
    • http://files.stringsforhope.org/uploads/1/3/0/7/130739758/kebut_lotofutulebapar.pdf
    • http://files.jdalestudio.com/uploads/1/3/1/8/131871740/7ed494cc83e6ca5.pdf
    • http://files.sawdustsistersbirdhouses.com/uploads/1/3/2/7/132710780/fulagosaxevi-fogiwurirako.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/lavukigumina.pdf
    • https://cdn.shopify.com/s/files/1/0439/5253/7758/files/24540866549.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/libertarian_paternalism_is_not_an_oxymoron.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9367/files/67857946527.pdf
    • https://cdn.shopify.com/s/files/1/0431/8448/8607/files/bragg_s_equation_derivation.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/firodogiled.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8342/files/modusi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8310/4409/files/3909722265.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/95732629343.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/16005866272.pdf
    • https://cdn.shopify.com/s/files/1/0437/6877/4814/files/rubum.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_off00007974.bin
a968352e98eba8c42383441f8ff35c9ac8cd91782991a34d19150e54c330f64f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7974 5192 bytes
font_01_sfnt_off00008af5.bin
1630b146672137ba5e23826c87bf73e35d43d75a218a20d08cfaf366183f028c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF5 10592 bytes

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