Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e525ac23c1505c…

MALICIOUS

PDF

50.3 KB Created: 2020-08-30 19:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b10c98fbf7409eae4e65aa1f486dc680 SHA-1: 3b872e065f04862b6193671ef23378636e46618d SHA-256: f5e525ac23c1505cc2decdca7873abb858f846544eff88b461d0796fd322756d
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL points to a redirector, and the document body, though garbled, contains the same URL. The primary malicious activity appears to be directing users to external, potentially harmful, web content.

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.com/wix?keyword=patofisiologi+asma+bronkial+pdf
    • https://static.usrfiles.com/ugd/b8c837_d9bc30d8345c4a9bab3030cf77febca1.pdf
    • https://static.usrfiles.com/ugd/cc03df_b6456e5eb4fe46a59a5e0cf162846728.pdf
    • https://static.usrfiles.com/ugd/b8c837_c72d4cc9d08e407a96a115c73616bcef.pdf
    • https://static.usrfiles.com/ugd/e2c250_6bb8adcf0cd84464a968ac9cd0167d3d.pdf
    • https://static.usrfiles.com/ugd/b58d21_a2c2eedef64e4ba7bc72fb66de935e8d.pdf
    • https://static.usrfiles.com/ugd/529dbf_964da532af404702835c440a190adc2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_48646006ced8452bac9de811d8a80175.pdf
    • https://static.usrfiles.com/ugd/f515ca_fbab2d5d138d45a886c099d4402ee795.pdf
    • https://static.usrfiles.com/ugd/ace02d_a02131018be44e6ca6c5d943bd4385fe.pdf
    • https://static.usrfiles.com/ugd/12745a_2104ee28382e4f2fa3e0831744d28ac3.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_fda72843032347fcb3eda9e4f44fe281.pdf
    • https://static.usrfiles.com/ugd/3b7182_4ad5387ca4bc464ca2e80148b9609cd6.pdf
    • https://static.usrfiles.com/ugd/b8c837_19d6b2351b174b71a02d7582669cccff.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/kakof.pdf
    • https://cdn.shopify.com/s/files/1/0432/3078/9800/files/vubuwatoberozesofapilo.pdf
    • https://cdn.shopify.com/s/files/1/0463/8962/4987/files/tarovopupomatiwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dipudakafadaned.pdf
    • https://cdn.shopify.com/s/files/1/0462/3581/2000/files/92388750970.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_off000085be.bin
bf782a025bf566ed915c1d78cfb7da7b9949b20487909d362dd7bff633d4896b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BE 5564 bytes
font_01_sfnt_off00009889.bin
3589788c7a036ac24b7dbe1c7e4c02abb81e846012f5dbbee66aba3a4e7237e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9889 10700 bytes

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