Malicious PDF — malware analysis report

Static analysis result for SHA-256 73564bc89d325de8…

MALICIOUS

PDF

45.4 KB Created: 2020-08-29 17:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f728eb496e0baffd0e51bc3eed3fb29c SHA-1: 1c668338c670ffd68db1926d6cb54984d2ecdcfb SHA-256: 73564bc89d325de89eae201251c1117ffc8267d41341f59f4d4fcee9d536740b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised with a keyword relevant to woodworking. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, suggesting a link farm or SEO spamming operation. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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=livre+charpente+bois
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/de60da_8a6785c549e144f38c997f8cbc58fbf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_557042824bb64950b51f14f45456db10.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd721f7212b0415da5a7c2f9291e5e35.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1566/files/nomuwifuxenuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/hormone_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/nuniwavomewena.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8323a88032a41128fba3159627adb88.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa32e7286ed54b8caacc51df05390803.pdf
    • https://static.usrfiles.com/ugd/b8c837_b665a348b6144919aacb5c9f5cfc3fc8.pdf
    • https://static.usrfiles.com/ugd/a382ee_ec8b0ef1794a444f87022829904de286.pdf
    • https://static.usrfiles.com/ugd/b8c837_04244193227144738393786ac1a82aa0.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd14f7741d064e7fa4c6a787b5d1c254.pdf
    • https://static.usrfiles.com/ugd/f09a9d_b317809fa23447619bb1a7e2edc5043a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b51c96207ff748869eea4b0dcbe50a33.pdf
    • https://static.usrfiles.com/ugd/8b2c09_d8820909ef454627a6a8c22a629e60ae.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053df.bin
bbbfab4628fc9311453807447c26d58c5b8c24ed5b7e689e5657b8312af0bdb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53DF 5132 bytes
font_01_sfnt_off0000653f.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653F 1800 bytes
font_02_sfnt_off00006dcd.bin
5f9c3e668e4af5ebc03f94dd2c796ad722542eeda64faa2f93f9750bc0477fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCD 11208 bytes
font_03_sfnt_off00009151.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9151 16312 bytes

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