Malicious PDF — malware analysis report

Static analysis result for SHA-256 88062f721a264e56…

MALICIOUS

PDF

44.8 KB Created: 2020-08-06 04:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d379790e1e21f583fe8f1d15ce99210 SHA-1: 706050fc9ec8fdcd013a06cd8e976b30b3b45563 SHA-256: 88062f721a264e560388ba0ed3171d9ee3a5fdf218bd0de7f6adc3e55773f602
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to drive traffic to potentially harmful sites. The document body, though heavily obfuscated, contains text related to 'perimeter and area of plane figures worksheets pdf', likely a lure to disguise 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.ru/pify?keyword=perimeter+and+area+of+plane+figures+worksheets+pdf
    • http://files.consideryourselfwarned.net/uploads/1/3/1/6/131607163/1901786.pdf
    • http://kizexomer.geoffalainllc.com/uploads/1/3/1/6/131607062/795be.pdf
    • http://files.mentaleclipsetheater.com/uploads/1/3/2/8/132814958/1421345.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdf
    • https://cdn.shopify.com/s/files/1/0440/5228/3542/files/fuvipudoni.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/71794242816.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9969/files/zejofosov.pdf
    • https://cdn.shopify.com/s/files/1/0434/7586/1656/files/perexus.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/pumejozexabijiwamuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6370/files/zetorakabewokuridamizi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6384/files/38406978307.pdf
    • https://cdn.shopify.com/s/files/1/0428/6890/0006/files/90151999542.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/desanurasaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4641/files/rafeluxuwaxota.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/lonekedarezogizido.pdf
    • https://cdn.shopify.com/s/files/1/0431/4782/1212/files/jatitowuzepujedaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/arduino_i2c_scanner.pdf
    • https://cdn.shopify.com/s/files/1/0440/4664/7446/files/la_peste_albert_camus_livre.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b44.bin
6241abf79d74e08f938d8c76e2268e1a84be262a804c48fb3ebe8e103b644374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B44 5612 bytes
font_01_sfnt_off00006e42.bin
b8ee1f831666ac8b7a07d8828ff4ce340101035f00bad52f7ec7510a6428b9ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E42 9956 bytes
font_02_sfnt_off00009085.bin
73880e79b460d8357fde832bf5cc58d8e7a3b3b3a063c1e5ecd232e568756796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9085 16116 bytes

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