Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fc73dca8adb8d3…

MALICIOUS

PDF

40.2 KB Created: 2020-08-04 03:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fac1108a59d672a5938ce6bede4c7886 SHA-1: c95e8cea8c335096615b61f1c6d51e7f1e6d1186 SHA-256: 33fc73dca8adb8d360f8d7a9b141a340b468df70c6696a6803de1f1db24a6b95
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

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/pify?keyword=types+of+amnesia+pdf
    • http://files.greenwaymetalrecycling.com/uploads/1/3/2/6/132695343/fituwurub.pdf
    • http://files.cleggenglish.com/uploads/1/3/2/6/132681342/bavutitukadu-voravajet-mazefopij-boluwok.pdf
    • http://nonofe.amandalsylvester.com/uploads/1/3/1/6/131636655/wagiravun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3033/2070/files/jilodobediv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/tuxasubojekur.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/80959622430.pdf
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/viporekukisaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/0241/3735/files/php_parser_rss.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/squall_lines_generally_do_not_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/7308231631.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/61173444289.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/62671835191.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/1363852262.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/13505023491.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/15036306670.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_off000060f8.bin
91c930e759ec08ea48f35c2405b36acf43e26a9a2b78567848d3d37140e0ba69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F8 5108 bytes
font_01_sfnt_off0000725b.bin
a60ea07c22e67f61dddb8a262f344e246ad7de0c927f457e5325317aba4bd349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725B 10044 bytes

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