Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3c748c37104916…

MALICIOUS

PDF

48.6 KB Created: 2020-07-22 20:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbd9c331d3f43c13f22932909fbee075 SHA-1: 271c8d8c32aaf64306f0a80ac1a7ddaf72a5ca66 SHA-256: 6e3c748c37104916e9758bfe7d0e64db54ada3f903539ed135dd70bfb14ea83a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external PDF files, a technique often used in SEO link farms to manipulate search engine rankings. One of these links, found at https://ttraff.ru/wb?keyword=manual%20greasing%20gun, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of 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/wb?keyword=manual%20greasing%20gun
    • http://files.cyperformingarts.com/uploads/1/3/1/6/131636676/bafupapibin_wamelenazep.pdf
    • http://files.conniewesley.com/uploads/1/3/0/7/130738850/4938824.pdf
    • http://files.jennyrollsyoga.com/uploads/1/3/1/4/131452823/7263355.pdf
    • http://files.gregoryebarnes.com/uploads/1/3/1/1/131163620/13ade58ccd2.pdf
    • http://files.fellowshipmsc.com/uploads/1/3/0/8/130873718/08b0dc4461757.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/47038624492.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zudofujavulasosajawigubi.pdf
    • https://lixogobofa.files.wordpress.com/2020/06/17366151635.pdf
    • https://nonetesafovo.files.wordpress.com/2020/07/dojakikazigo.pdf
    • https://sixupijemiw.files.wordpress.com/2020/06/53838152360.pdf
    • https://ralukimi.files.wordpress.com/2020/07/motogu.pdf
    • https://nipatojubob.files.wordpress.com/2020/06/lafipobapifubuxakigel.pdf
    • https://cdn.shopify.com/s/files/1/0431/7773/8399/files/41928636909.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/simunotasawonu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8116/3157/files/75186424730.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/94281124652.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/47601486136.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/23576166862.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/83697170398.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.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_off000082d1.bin
83422df2c3bbe43f078ed3a62d77808b22425fc2af665d76a25111148c412042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D1 4552 bytes
font_01_sfnt_off00009241.bin
1bfe18489541163a6fd795a45a7ab2d1bc1721e4cad06df5d5d6302de59752d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9241 10096 bytes

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