Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd4fd91eeb3658b…

MALICIOUS

PDF

39.5 KB Created: 2020-08-31 15:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32fe744c62c5a28c7ea61d900c95cc6a SHA-1: 2d60b3fa7c121e4adfc7479c48536a258fab4e02 SHA-256: 5fd4fd91eeb3658b42052091363abf2643acfadc9a16efe0cb38b83a20d71652
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting a phishing or scam attempt. The PDF also contains a large number of external links, indicative of a link farm, which is flagged by the PDF_SEO_LINK_FARM heuristic. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly suggest a phishing or scam campaign.

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/wix?keyword=audio+cutter+free++for+mac
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/913720_fcbaf1451c9441048f7171ac1a9de5bb.pdf
    • https://static.usrfiles.com/ugd/a467d2_28362b67829045cd8278c994fbb50414.pdf
    • https://static.usrfiles.com/ugd/f459ea_c7180f81dd1a442d92ff9be643b78028.pdf
    • https://static.usrfiles.com/ugd/b8c837_36175126d85041f993b9c1f4e066a536.pdf
    • https://static.usrfiles.com/ugd/defdb4_e8d50024aa8d4f0aba8ae1e4cfb3ef70.pdf
    • https://static.usrfiles.com/ugd/3f0e57_f692181a655b490eaed240536a914603.pdf
    • https://static.usrfiles.com/ugd/9d66c7_a4f2c35395bf4173aac3c7063b163c6d.pdf
    • https://static.usrfiles.com/ugd/73f3b0_5aa4309fc52d40e1a0880abc81bf8696.pdf
    • https://static.usrfiles.com/ugd/0d2908_7e5c6a44ac204b5eacfd3c7c9380a8d0.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/kenimir.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/cfa_level_1_book_3_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6488/files/bosch_security_software.pdf
    • https://cdn.shopify.com/s/files/1/0433/8089/9989/files/tapufilibaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/zoxelunulapuxes.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/bufilol.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_off00005e54.bin
40aec37ca4ddc83fa41b0a22d717906c0486688cb820999fcea556fc4cd8feef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E54 4948 bytes
font_01_sfnt_off00006f10.bin
4bbbefc1fcdc94c3fe106b5307eefe93a133ff89aa50532d9c39a9ec295a3804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F10 10024 bytes

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