Malicious PDF — malware analysis report

Static analysis result for SHA-256 142c0dc617e2abcc…

MALICIOUS

PDF

36.7 KB Created: 2020-07-11 21:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a67f8767cdf3eca61f06b3f0d2875f1 SHA-1: 788b41772e9449cd0668df73fb9084c604bf4b77 SHA-256: 142c0dc617e2abcc5f2719bfa4298810bc24a6d6e5a870f219318c1f1985916d
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 of which point to external resources, suggesting a link farm or SEO poisoning tactic. One of the primary links directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though partially corrupted, contains text related to a 'grammar worksheet' and includes the malicious URL, reinforcing the lure.

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.cc/wb?keyword=grammar%20worksheet%20grade%205%20pdf
    • http://files.louisianascreenwriter.com/uploads/1/3/1/8/131857847/gofetexezomilutadol.pdf
    • http://files.tesoltime.com/uploads/1/3/1/4/131437832/2196965.pdf
    • http://files.collinskindergarten.com/uploads/1/3/1/4/131437475/5f48950.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6574/5312/files/8531168157.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/fatapomigu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40429789840.pdf
    • https://wefeguzuvijo.files.wordpress.com/2020/06/76599588249.pdf
    • https://bulijedakuve.files.wordpress.com/2020/06/dojolufutubogom.pdf
    • https://pakekisisoki.files.wordpress.com/2020/07/mukigug.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/rudafavexegutokujerogagu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/razikeruranofe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/8441076578.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22271122494.pdf
    • https://cdn.shopify.com/s/files/1/0430/3156/0354/files/jaxigopik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.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_off00005239.bin
96b55a47db8c6b34a8513b32718ebb3e6f22d074b1de308dc2e32df1ad35680f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5239 5368 bytes
font_01_sfnt_off0000649e.bin
62b62eda52359c44ac5176b73893d80c89e50d091f51e7b36f644015eda708b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649E 9912 bytes

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