Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6155d55be6531ad…

MALICIOUS

PDF

41.6 KB Created: 2020-08-30 04:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f545e1b8e7198dba6cb182db08c1c07f SHA-1: fcfc0d4569e44522f3400da0a381f98e891d8c68 SHA-256: e6155d55be6531adf3a1c38f9cfbde649c89ba66dc7e3f5a83d06eb2589b7267
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded links. One of these links, https://ttraff.ru/wix?keyword=ati+radeon+hd+4300, is identified as a known malicious redirector. The document body contains garbled text but also includes the same malicious URL and several benign-looking Shopify URLs, suggesting a link farm or SEO manipulation tactic. The primary attack pattern involves luring users to malicious infrastructure via these links.

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=ati+radeon+hd+4300
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/ribubajuronudo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7965/files/essential_oils_and_uses.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7470/files/15151806978.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/55740926862.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2485/files/adding_and_subtracting_integers_practice_7th_grade.pdf
    • https://static.usrfiles.com/ugd/314c35_87fdcc2bb58f4cb882375c9777b92158.pdf
    • https://static.usrfiles.com/ugd/5b604d_eb318b655c354d82b148a90145f1e8a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbe712cf79044c0db5f095efe17b8408.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c2822a9f28f4b95b2d64dc3fd33af63.pdf
    • https://static.usrfiles.com/ugd/3e87bf_d65851ba17a14c3fb3ee4d98fd29c00a.pdf
    • https://static.usrfiles.com/ugd/b8c837_01691dad6cbc42808a6100412fca9911.pdf
    • https://static.usrfiles.com/ugd/b910ae_0c0b2ee46178444da6d5767740c02e73.pdf
    • https://static.usrfiles.com/ugd/6f53d7_2b43313de5994772a30dac388a8d5038.pdf
    • https://static.usrfiles.com/ugd/7c3584_8bcffcfde72846f9a15adae44729c46a.pdf
    • https://cdn.shopify.com/s/files/1/0439/9097/4622/files/51875487423.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/fegakuzenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5945/3845/files/artforms_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/soxamekebusobarekaboz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejozetopugewafapo.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_off000059d5.bin
b52480f07aa082085b837c40012a889e9f2009d06857b8b3c7dd81af39acd20e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59D5 5084 bytes
font_01_sfnt_off00006b17.bin
70c4413866c10a51fa6b74119add651e0b7198778be14b16f5d726ccedff26f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B17 15140 bytes

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