Malicious PDF — malware analysis report

Static analysis result for SHA-256 790a7b7efe74c223…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 21:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a08651737d87cb66f64e5e58432707ce SHA-1: b14180a78c70aee0465f3c9d3ebe06f412374baf SHA-256: 790a7b7efe74c22321fb938fea4c854dd13c7fa1b4d29e5328ed3d2062b55998
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with text related to a movie guide. The document also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards a phishing or malware distribution attempt.

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.me/wix?keyword=domino+movie+2019+parents+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e2685bb0124642d180590ce27b53133b.pdf
    • https://static.usrfiles.com/ugd/b8c837_35695968fed741b7abf77f63de221c93.pdf
    • https://static.usrfiles.com/ugd/b8c837_18d61d32f680409ea84229b00bd7fdaa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4373/2126/files/nurafokodurugojejadovam.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/convert_base64_to_javascript_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/1422971304.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/21590489198.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://static.usrfiles.com/ugd/3aca14_0ab9f0ebd3554343b473e66f984d2398.pdf
    • https://static.usrfiles.com/ugd/f3cb45_63200e6180204cdb9e9741748ae5b513.pdf
    • https://static.usrfiles.com/ugd/db93e9_a52d418ede60486d8ae1d70a0bac4956.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4105a9085274f2aa15636327422548c.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_off000060e5.bin
6a45c45e92ad23512ced623b429cfc3e7f5b24c383dd4ca03be70ca5574a0ca4
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E5 5788 bytes
font_01_sfnt_off00007493.bin
e9dbb9cd08051dd70aac09c8a47a89e536bf39df307ad48906d30761fa561e17
pdf-font-stream PDF embedded font (sfnt) at offset 0x7493 10268 bytes