Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fba111911e03cf4…

MALICIOUS

PDF

39.3 KB Created: 2020-09-06 17:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02d03233b4c0a65a84bc16413dba3421 SHA-1: 82eed1fb7522c5dc0aca06945461ebcba2b562d7 SHA-256: 1fba111911e03cf42cc4399fb120f4762213eb75db59b73952c189461035f28c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. This suggests the PDF is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.me/wix?keyword=academic+table+of+contents+word+template
    • https://static.usrfiles.com/ugd/4f92c1_2c0d1b2cfc624145b3bb7f126434dbbf.pdf
    • https://static.usrfiles.com/ugd/b5aed9_5a3aa2b24b4a4d13892aa3a44b28473a.pdf
    • https://static.usrfiles.com/ugd/cb2bed_15c3403d58a0473286ae84cc358d44f7.pdf
    • https://cdn.shopify.com/s/files/1/0462/0088/1315/files/zopuridukewomamugitenes.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/behaviourism_and_mentalism.pdf
    • https://cdn.shopify.com/s/files/1/0461/9108/3678/files/chrome_older_version_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2844/files/pearson_education_5th_grade_math_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/livro_arquetipos_helio_couto.pdf
    • https://static.usrfiles.com/ugd/359e64_4bf8a177547e4c84ac3175a57b61cffb.pdf
    • https://static.usrfiles.com/ugd/912de2_0f1ebd264ece438f8e4d126a66ef7c12.pdf
    • https://static.usrfiles.com/ugd/409ca8_232c97ce9989452fa0320c26e950db44.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_off00005b71.bin
e4768a9a53e1d701a272d4f7d55b03840723dd62c3d0dcef7dc69c4ca3e79e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B71 5520 bytes
font_01_sfnt_off00006e32.bin
6826a672055a6c6fa7975b8e8b2300d9600c341fde7c72d46a627962d7d4600f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E32 9980 bytes

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