Malicious PDF — malware analysis report

Static analysis result for SHA-256 878871d0b9a2ae95…

MALICIOUS

PDF

47.4 KB Created: 2020-08-29 18:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68f716635dcbf6993c40d806807a3fc4 SHA-1: 82aa10f67b27197db44ee526786baf836291bca9 SHA-256: 878871d0b9a2ae952b2c892642f8bfeae558a26ee10e1a0b53e91df088643955
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL associated with known malicious infrastructure. The document also exhibits characteristics of a password-protected archive lure, suggesting an attempt to bypass security controls by encrypting a payload. The presence of numerous external PDF links, many pointing to benign content, suggests a potential SEO-based lure to drive traffic to the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=paragon+hard+disk+manager+15+premium
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a48928_3467ab11a50b400d8212c9b5b010f2fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fa8e13d06d84d439f7196995f227ae9.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f676f4ff3d146058fef31fa5db7fc70.pdf
    • https://static.usrfiles.com/ugd/b8c837_e17292eb6db1468bb6f5aa040c921649.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8239/files/common_core_4th_grade_math_measurement_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/jiginubodizilinulokutake.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/55139648222.pdf
    • https://static.usrfiles.com/ugd/b8c837_98fc5aa7399b4310be49e70d6ba902a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_d72bf1bb1da8404abea58e9d5f721bac.pdf
    • https://static.usrfiles.com/ugd/b8c837_84d00b0aba554ca59aefe89adaa1aa86.pdf
    • https://static.usrfiles.com/ugd/b8c837_59eba415dd24402eadfa50bc7d0585f8.pdf
    • https://static.usrfiles.com/ugd/162fe6_3ff634d70bfb4a94b68b1e99181bea09.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcc87629cb534cf2b9ec74ea4d011f03.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4b27a19a9c04f3e986963b242c21e9b.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_off00007bf2.bin
f40ae7cc11e4c80c5062f49d4eea34c302cda33829614f41f9e3258678741ff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF2 5580 bytes
font_01_sfnt_off00008ec3.bin
538271306fa4ab25db43415c742d8bd976ab9649819d780749b5c35807e91601		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC3 9844 bytes

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