Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d18c5c416eab29f…

MALICIOUS

PDF

49.9 KB Created: 2020-09-07 14:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b230f5ec08a6ee87aa6c067dcb8d6f94 SHA-1: 6ad0936c3d0a453600ceff9c5aab0d68c7051bbd SHA-256: 2d18c5c416eab29f224b0487e3f6003ffcf6ad62d4f78b03acc0c887600f925a
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 pointing to a redirector service, indicating a link farm or SEO poisoning attempt. The primary malicious URL identified is https://ttraff.club/pify?keyword=word+form+ngh%25C4%25A9a+l%25C3%25A0+g%25C3%25AC, which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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.club/pify?keyword=word+form+ngh%25C4%25A9a+l%25C3%25A0+g%25C3%25AC In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/a98ecc_a05d38aac37344198bc937319fde3b43.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f84671_3bdd6a364097454082bb43607c8bb42e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/253000_5255ced3b40643e3a9721ada8986ead1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e3ff21_6aa64b3ad43746de9903233e1a76fde0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a2c2bc_da57a6109fe240f886983f82a46272a4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/daca0d_49b258698e6942d5ad886b5283dafbae.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/48f461_e8e040f0cc3a4b119994ce03797eaf67.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b1b3ad_09a1f344549c4ab1a6244aa0e208438d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/de60da_5fe30b95ae5746e286ab5107f79fdac8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/49be48_dfea464bb4a6451fbba2d2744de64341.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2244/9820/files/pewufujusoxuvavegudisoref.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4169/2580/files/16620836064.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/dad90e_80801f49420944288c8da759162b8409.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/143c98_7c5bd06ea2ed4935a1df72789b790eb9.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA5 5580 bytes
SHA-256: 870cca0e0b3a83434f71a9a98623d752e4ca5cc7fe94f3bbbe78df0c28d37a56
font_01_sfnt_off000090f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F2 13304 bytes
SHA-256: 4e76164093dc76e2660dfc2110f5ea7455e3741fc22d1dc98a9ea9ec627a6029

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