Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f65ce1a4ecdf2e…

MALICIOUS

PDF

35.6 KB Created: 2020-08-06 21:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84dc193b0ad19bf06e76a65d59e2506d SHA-1: c983cd2725004cedd0992c8a8d93a4b019d246c0 SHA-256: a5f65ce1a4ecdf2e2e04e783a94423fc92ce33695f50713499291ddb5b18dc21
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a technical book and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of multiple embedded links, including those to benign Shopify domains, indicates a link farm strategy. 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.ru/pify?keyword=computer+application+in+mechanical+engineering+book+pdf
    • http://files.xosoft.eu/uploads/1/3/2/7/132712116/37a7becce52.pdf
    • http://goxen.milightning.org/uploads/1/3/1/3/131381464/2a7f2.pdf
    • http://files.helamansonsletters.com/uploads/1/3/0/9/130969545/5bab081cbc7a8.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/pdf_split_tool_portable.pdf
    • https://cdn.shopify.com/s/files/1/0436/0981/7251/files/how_to_develop_your_self_confidence.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9030/files/giberokagimarogiwuja.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7669/files/mubat.pdf
    • https://cdn.shopify.com/s/files/1/0432/2253/2251/files/brics_summit_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/calculus_for_dummies_patrickjmt.pdf
    • https://cdn.shopify.com/s/files/1/0437/9063/1064/files/36904983669.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/36316216581.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/mixufo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/xezanomezuniginujirod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/magej.pdf
    • https://cdn.shopify.com/s/files/1/0434/7494/4153/files/gasumupawipevabaromaka.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_off00004c6f.bin
0219466c03d05dd5f85ce286b7b975d61f6c4cfa656c9bd659ed54cfbfa07aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C6F 5500 bytes
font_01_sfnt_off00005eef.bin
0693e6401125dd42ca3d3201b23ae51b317e18ffc0dd63b066fcf12bd2a39de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEF 9988 bytes

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