Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4463cbf58335cf…

MALICIOUS

PDF

53.0 KB Created: 2020-09-01 02:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 297167d154ca6c4c6356c6d2a6f9ea6c SHA-1: 4f00a12ffadaa8cd9c047a8ef4908b595b69ecb2 SHA-256: 1d4463cbf58335cfbc1a59f7cb0f994027da81725133211fea13e7eecde0f513
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=analyses+biochimiques+du+sang+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to PDF files hosted on static.usrfiles.com. The presence of a malicious redirector URL strongly suggests an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting. The ML classifier also flagged this PDF with high confidence.

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/wix?keyword=analyses+biochimiques+du+sang+pdf
    • https://static.usrfiles.com/ugd/54fa57_e2b69bb6711b4fdab49b96d6041f741a.pdf
    • https://static.usrfiles.com/ugd/afe78f_dc8fe6d097d74ea8ba8fb3a4ef4d4bb0.pdf
    • https://static.usrfiles.com/ugd/87d215_47786cd9bdf94206a6f669e28b843956.pdf
    • https://static.usrfiles.com/ugd/47b1e8_956f6a18921f4d9283f55aed684ab758.pdf
    • https://static.usrfiles.com/ugd/12745a_a06e2da8b1f94c7f82859ee1b26eeabc.pdf
    • https://static.usrfiles.com/ugd/db1da1_e3e45ccdb3e3457ea00888a30b1e2f07.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fc7cd52579b4cd58e18835e14608acb.pdf
    • https://static.usrfiles.com/ugd/912de2_c3495eafe1c8400191a8c615ff9676c2.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2451/files/sokafub.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1183/files/el_cantico_de_las_criaturas.pdf
    • https://cdn.shopify.com/s/files/1/0439/2920/6952/files/cardinal_points_optics.pdf
    • https://cdn.shopify.com/s/files/1/0430/6921/0773/files/agenda_2030_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/zogasemagagemonuxowi.pdf
    • https://static.usrfiles.com/ugd/4826f5_b9d793d35ea943e0bbf96954179c1e26.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fd77c42eef24774887556e184ab81f6.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_c30ed9847c46474d9c7b57c4229f7997.pdf
    • https://static.usrfiles.com/ugd/628a76_eb61f621e7374d88a695c799beae4aa7.pdf
    • https://static.usrfiles.com/ugd/8127dd_5e0ab3ff59da457a991bdb273c329b04.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000807e.bin
edc88481af1470fe2d1873183ac4d18342c598c2ef3efb8d4801f0f59a9b6887		 pdf-font-stream PDF embedded font (sfnt) at offset 0x807E 5632 bytes
font_01_sfnt_off00009371.bin
d50fc36a07c9e8338b1625bf112ea362a6f344b15fc04b23decd097669de8d93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9371 11404 bytes
font_02_sfnt_off0000b6fb.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FB 4324 bytes

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