Malicious PDF — malware analysis report

Static analysis result for SHA-256 a523c2bb1bb0a6f8…

MALICIOUS

PDF

36.5 KB Created: 2020-09-04 08:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95359af74127be97bd5e71378a2a4e2b SHA-1: 1ddf26a86e98c4b196330961cd4880ae46505320 SHA-256: a523c2bb1bb0a6f8a9728ef9c96a5b3d93a9602ca0fcf05ee762db09da0ac29c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.me/wix?keyword=bergen+performing+arts+center+nj'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links to external PDFs hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to disguise the malicious link within seemingly legitimate content. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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.me/wix?keyword=bergen+performing+arts+center+nj
    • https://static.usrfiles.com/ugd/6cf0f5_72406d2923ad445b87029daa3b1672ba.pdf
    • https://static.usrfiles.com/ugd/113e89_2170d18ed1bc431c812a7b0818f103cf.pdf
    • https://static.usrfiles.com/ugd/966478_93ffc53007e34a28b1cd4dd81166a92a.pdf
    • https://static.usrfiles.com/ugd/49be48_ed1a96a872ac4753be1fcf769af5b76e.pdf
    • https://static.usrfiles.com/ugd/808d8c_2d7f6a8f172548faa5fd3c42b2edc1bc.pdf
    • https://static.usrfiles.com/ugd/1c8c1e_fdf80f7b192840829831e5b843aa1f22.pdf
    • https://static.usrfiles.com/ugd/dd4472_2e65a27de3714a5ca598242657218e12.pdf
    • https://static.usrfiles.com/ugd/efb3f0_f5b1dd5671ed4c49ace9df04772e9bcf.pdf
    • https://static.usrfiles.com/ugd/6d59ab_9ec7b0e664314e5aa5d261f9619f5ca0.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_b228a05a8dae401eb1a8a6e60343702d.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/41799709514.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9460/files/design_and_analysis_of_sorting_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0439/1262/6344/files/miramont_apartments_fort_collins.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050d9.bin
ec5655c9110f2e76502e0a1240ca68dd9bece2fe93a6676ffa2ee999b9f57a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50D9 5428 bytes
font_01_sfnt_off00006348.bin
0f5b6182737e642b6373ac1a23bfbc10455dbe971d00b823b03e18bb7ac419a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6348 9964 bytes

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