Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8084c91efc9878…

MALICIOUS

PDF

120.4 KB Created: 2020-08-13 07:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf61f8a3df06ebfc9e7ee4a21181eb05 SHA-1: 86e4b86924bf23230de69af082868f8dbba3323b SHA-256: 9f8084c91efc9878df4e38dd6851b30b1c08628104a327e6a17865910490a2ff
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to a URL that is part of a known malicious redirector infrastructure. Additionally, the PDF exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted from this sample.

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.cc/wb?keyword=laser%20b1%20student
    • http://files.ankionthegroove.com/uploads/1/3/1/0/131070971/7001051.pdf
    • http://mavebigo.olympiasouq.com/uploads/1/3/1/4/131452903/pikopasepapo-nipuwuwoxukikaw.pdf
    • http://files.glambarbyceline.com/uploads/1/3/2/6/132696104/0fa34a6c45e.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0792/files/nukotenuvaxupakopum.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/60277289282.pdf
    • https://cdn.shopify.com/s/files/1/0437/3243/5093/files/najedoginimovuzuri.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/strategic_management_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/vexitagiwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/34503439746.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6034/files/bakteri_bacillus_anthracis.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/36501345597.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0434/7448/5400/files/bovamikajumebimuvapa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/wetozejoninuletenufox.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/gtd_weekly_review_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/50206021311.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_off00018e86.bin
f3b90fab0726f84ac50b9ef2c1d1323ce0537e47d77c1b762b20d7b90de0de4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E86 5428 bytes
font_01_sfnt_off0001a12b.bin
c967e4959c5fc5096d9cdf857a30884269960e4a7b0381a647bfec452236ca31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A12B 16260 bytes

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