Malicious PDF — malware analysis report

Static analysis result for SHA-256 780a7c9c278c789d…

MALICIOUS

PDF

37.9 KB Created: 2020-08-29 16:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90ff9e1b8dfb5e5e1466c9adfedc63a1 SHA-1: 5495e48241722ea747b07a0f82fd9c4bcb544fc3 SHA-256: 780a7c9c278c789d3bddffda6dedbe3d832c917943ef2c1f6702f416ec86f611
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=assessment+made+incredibly+easy, is identified as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous external PDF links, suggesting a tactic to distribute or obscure malicious content. The ML classifier strongly flagged this PDF as malicious.

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=assessment+made+incredibly+easy
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_0852081b39c14d01beebae5b6fbdd89e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7639605d2e23480d8678cb82f7e0aed6.pdf
    • https://static.usrfiles.com/ugd/b8c837_67f954714fd845bf9e5cb4d42bc17c94.pdf
    • https://static.usrfiles.com/ugd/b8c837_774e34e6324e41a6bbdb3a5d74b2e37a.pdf
    • https://cdn.shopify.com/s/files/1/0463/2379/4077/files/begogigefale.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/rumup.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/computer_words_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/8442/2051/files/genetic_variation_in_humans.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/a._s._gupta_calculus_of_variations_with_applications.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed8f9bdbfa0e447d8cbe318a72c2cbf6.pdf
    • https://static.usrfiles.com/ugd/b8c837_46066584eee14407baa3d7244e503e91.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/ados_autism_test.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/93726781069.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9176/files/koraporanelumevozokewi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/biochemistry_lectures_for_medical_students.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_off00005497.bin
d32d86bc79577765a469ba972b6cfd4aa4e9f6d3a097b540b1a785074a07c3dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5497 5316 bytes
font_01_sfnt_off00006683.bin
c93aed63c08e924954410617e900898b17017823363385be1f396aa0e77078a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6683 10768 bytes