Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99036e635202772…

MALICIOUS

PDF

48.6 KB Created: 2020-08-30 22:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef8237a66eb0bc8fed0978a16e655628 SHA-1: dc0e19ad9201f631596566109cc255bef6bd0105 SHA-256: c99036e6352027729f9ed8e24fdc9e80dc4f8d40bafe63a7922517ff5507264e
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link to a known malicious redirector. It also contains a large number of external links, characteristic of a link farm, with the primary redirector URL being https://ttraff.ru/wix?keyword=paperweight+meg+haston. The document body, though heavily obfuscated, contains this same URL, suggesting it is the intended destination. The presence of multiple Shopify URLs, some confirmed benign, indicates an attempt to obscure the malicious destination within a larger set of 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=paperweight+meg+haston
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/vovirujevezofiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3913/7697/files/fimirobimuxizili.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_853b1ccca55c48dcb2f1882ac7f090c2.pdf
    • https://static.usrfiles.com/ugd/8acad3_db93e1e780b44ab7b24b04b1981ab682.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5c3234a0c6d4ca9ad8487bff3f9df42.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f42116102f64ca3866508ef0553202b.pdf
    • https://static.usrfiles.com/ugd/b8c837_12cdad824b15451aa7f3ac4998643da9.pdf
    • https://static.usrfiles.com/ugd/b8c837_14104f3d5adf4f858db1a113b1010be9.pdf
    • https://static.usrfiles.com/ugd/b8c837_5784fc09946c43cf9efc5ff985258230.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ae9e16d59ed47b1b9ebd420543c6745.pdf
    • https://static.usrfiles.com/ugd/405339_5b12b3ee6cb4462f85c6d2529d752432.pdf
    • https://static.usrfiles.com/ugd/a2d007_faf83632cc634c7ebbba48a26249eb96.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_9fedd86c81af46bbb5b7e354ff35e2fc.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/
    • https://static.usrfiles.com/ugd/8acad3_db93e1e780b44ab7b2

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000810d.bin
723be305ae79fb151a008323285aea6836c783c05a768550efe149d703672f72
pdf-font-stream PDF embedded font (sfnt) at offset 0x810D 5296 bytes
font_01_sfnt_off000092fc.bin
65123dea4a8d40fd1eb3020b590509056cbe38c8c825a2c2c43997899dfba1ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x92FC 10072 bytes