Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b58290c889bc8fc…

MALICIOUS

PDF

32.4 KB Created: 2020-09-01 10:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9726c0e0f4f26fd6eeef049c30770516 SHA-1: 6d2044066400188a1aca6644c7ab6de501ef5beb SHA-256: 3b58290c889bc8fc427a50b9d8854ccb2a699992501557c7377633654c71b764
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though partially corrupted, contains the same lure text and URLs as found in the heuristics, suggesting an attempt to drive traffic to malicious infrastructure under the guise of offering free resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/pify?keyword=vector+coupon+borders+free
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/26093033523.pdf
    • https://cdn.shopify.com/s/files/1/0434/5341/5576/files/xazolukezu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/10th_new_syllabus_tamil_guide_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/8341/3142/files/wonuperatonadilinevukuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/26279066632.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/68226390212.pdf
    • https://cdn.shopify.com/s/files/1/0435/8737/1171/files/valonamutixotizebeborinax.pdf
    • https://cdn.shopify.com/s/files/1/0432/3613/0983/files/novekifijaduxepazefowor.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/negulonubivo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/angina_de_vincent.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/55165927803.pdf
    • https://cdn.shopify.com/s/files/1/0434/3680/2214/files/fadulifizibiwoxeri.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa1ed2993df2487d960fe704b1703569.pdf
    • https://static.usrfiles.com/ugd/12dc78_9f201edad7024d66a0b7410571fd3508.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa7348c0ba49440286388a7f8114c242.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_off00004393.bin
07cd342285c8978fe78092285ed3bd99eda8bbaa3b373444a3defd671b45ef02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4393 5012 bytes
font_01_sfnt_off000054ac.bin
69d15862d2f72786f2b0787813630dc65036ff01fa01e1e957d77993c3896b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54AC 9456 bytes

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