Malicious PDF — malware analysis report

Static analysis result for SHA-256 098a65c2388e32d8…

MALICIOUS

PDF

35.6 KB Created: 2020-08-29 08:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deee973ab8f44fb86456ef7b3ca199be SHA-1: a4f1cbb9021897186c011d1a33f7952dd04c23f9 SHA-256: 098a65c2388e32d83ac5be6e597029f9b77226880977823b1012ee807004a2b0
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 external PDF files, forming a link farm. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests an attempt to drive traffic to malicious infrastructure.

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.ru/wix?keyword=kicker+l7+15+sealed+box
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_525eb7ff9f524104a67912ea57094c03.pdf
    • https://static.usrfiles.com/ugd/b8c837_019bf0379c7b4e1faca1db5e2cfd3c5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_77bc6dec948540dc8be5515f749ffefa.pdf
    • https://static.usrfiles.com/ugd/b8c837_a79300031340454fa1555e5f191688e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_358530d5d96745719cec97db95ba54e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_07bfda3f47ad47bc857ddf167f47618f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c336f6b72fef46c2bcc4e53015fc24bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a4cee9358854ee29a3e77308ee60d54.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e59140ad36c4b709988c8119f3334c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a3b37f170d244a4b7b7ee49d1f1d659.pdf
    • https://cdn.shopify.com/s/files/1/0433/3689/2584/files/zoruteleve.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0875/files/68103548643.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/17826282057.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee72262d63474f8fb77f4387ba36a8f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b6d999c51a34c7996ee9ac66540983d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5d4a7022c8449feb37ebda458bdbc95.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e5f2ae6fe21450eb02d597a6e29cb83.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_off00004cc0.bin
fc702a7fb99e123dc3451b181fcf76d6bae77cd044f94c61b33ab2bf324b31b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC0 5432 bytes
font_01_sfnt_off00005f4f.bin
d21a95f982c1cd62aecd5e7e83bbad8a3ff07511e7f10091ad9c66cb934de5f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4F 10076 bytes

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