Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd9815b2a120eae…

MALICIOUS

PDF

49.3 KB Created: 2020-08-01 13:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9344a0096886ddf91f8a988caf911d5b SHA-1: 65232e73c63bd313ed3fcc530edae4ea0eda862c SHA-256: 5bd9815b2a120eae48ba8f89a3362a6bbabccacc98feb32b880d22a9b615a837
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of the URL 'https://ttraff.com/pify?keyword=byte+array+to+string+golang' further supports the malicious intent.

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.com/pify?keyword=byte+array+to+string+golang
    • http://files.kahntilesupply.com/uploads/1/3/0/7/130776590/tasorusiwo.pdf
    • http://files.warrencountyfoodcorps.com/uploads/1/3/2/6/132695465/jibuzitojesiso.pdf
    • http://files.evansmstheatre.com/uploads/1/3/0/7/130776757/volatokuxoj.pdf
    • http://files.kgsportsfoundation.org/uploads/1/3/1/4/131437418/17f1cdf1d3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6378/7170/files/62878453791.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/62793365794.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1284/files/varutilobib.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0257/files/mexaletubi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/51546541038.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/64534573965.pdf
    • https://cdn.shopify.com/s/files/1/0437/8243/9063/files/xmod_for_clash_of_clans.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/zojilijizezofa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0108/6111/files/xabom.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/38499940112.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/zalib.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/palokasekew.pdf
    • https://cdn.shopify.com/s/files/1/0434/2985/5393/files/525201655.pdf
    • https://cdn.shopify.com/s/files/1/0438/3657/1805/files/12561717543.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006184.bin
32d4891461d6d9e2fccd1e6a13731fd4d183e8714b28e9d89bdc0bd6551577e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6184 2896 bytes
font_01_sfnt_off00006bd2.bin
9ef67cd9804915246fdd4130f2bee1f4b6fcef0ea2f8ed2a78da610b82d19e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD2 5004 bytes
font_02_sfnt_off00007cf0.bin
c4f96919ed649c73e0f2cbf396c0371f3fa6fc33f055d8a7f6dbefb05f4f88e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF0 10980 bytes
font_03_sfnt_off0000a258.bin
b592b3af5b8e445e60cf9b49e381aa827ab26bbfe006501ce10ecda5201fb3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA258 16108 bytes

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