Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a7245bc736449f…

MALICIOUS

PDF

36.7 KB Created: 2020-08-29 14:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e00229b55f03260ab95e11dd0e207f58 SHA-1: 179a16a3892e3509b01c25589ba8ae42b97aa7d2 SHA-256: 64a7245bc736449f9d40fa62bc3bd09bb9697d69407ccb8b4907a1cf7b3aed3b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm designed to obscure malicious activity. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/wix?keyword=dark+souls+parry+sound. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, further supporting a malicious intent to redirect users to harmful content.

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=dark+souls+parry+sound
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kivamusefelozadadazub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rowogumidakedodovejizana.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/vupofamekax.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4658/files/30641058834.pdf
    • https://cdn.shopify.com/s/files/1/0432/0962/1665/files/rugademe.pdf
    • https://cdn.shopify.com/s/files/1/0440/1093/0341/files/imanage_worksite_server_administrator_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/9504/6811/files/13652762230.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb335737a47b4a68aba77d7ba136fa2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_fae9ca00ce134c25baf418245a62528c.pdf
    • https://static.usrfiles.com/ugd/b8c837_88d82e3132fc465c86738f2324a33424.pdf
    • https://static.usrfiles.com/ugd/10e3af_5514e65991a74e3cb3b2c59f421fa9be.pdf
    • https://static.usrfiles.com/ugd/b8c837_1035d7638ebd4db7a7bd4b6e53a0d5f9.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_16221201bd47459ea57138a9f3cd4e9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b55663334264b95a5a25ee1580b2602.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_off0000514e.bin
43081290b6e15df981c1b210dab328951e374cbe82fc7889ed7eff34cd27aee7
pdf-font-stream PDF embedded font (sfnt) at offset 0x514E 5120 bytes
font_01_sfnt_off000062d8.bin
cc9e68c3d22efb4d6b6c5a246ce343dad29a5268f84404fa113e04eadb472026
pdf-font-stream PDF embedded font (sfnt) at offset 0x62D8 10364 bytes