Malicious PDF — malware analysis report

Static analysis result for SHA-256 0664f6e77b355cdc…

MALICIOUS

PDF

47.0 KB Created: 2020-09-05 19:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5df9ffebc1b5cb9f29ba2df5d5fc26fc SHA-1: 8cf3bde42f9d73612e0f3367b654b163ccb0662b SHA-256: 0664f6e77b355cdc28dcc901a3689eecbbecfdb727b7a7cb6c7bd3847ef0b2a2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm or redirector service. One prominent link, 'https://ttraff.link/wix?keyword=dj+banjara+songs+ing+come+fast', is flagged as malicious. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting an attempt to disguise malicious activity as search results or file sharing. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=dj+banjara+songs+ing+come+fast
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1829/6232/files/nimoga.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1314/files/sizunot.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/6837856528.pdf
    • https://cdn.shopify.com/s/files/1/0462/1667/5482/files/stratiform_cloud_rainfall.pdf
    • https://static.usrfiles.com/ugd/e5a943_88d38cfd5716400288ec7e10f0c61e4d.pdf
    • https://static.usrfiles.com/ugd/b88e3d_41898760524d4e3aac9c80acd4a7f5a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c43ab42b40f4f7a892d247be19dfa8a.pdf
    • https://static.usrfiles.com/ugd/c4b402_8c0b3dee5b4647acb58627d1e20d5ffd.pdf
    • https://static.usrfiles.com/ugd/04c368_dc52d8bdbf5b4ea38034f42d4e4b08a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2a807880bc94fa796a6c93447feb93f.pdf
    • https://static.usrfiles.com/ugd/7e6083_48611085be3d4c22bc84204947484437.pdf
    • https://static.usrfiles.com/ugd/e643da_dc3d8178f47d45dea2ea432c7a01e178.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007953.bin
c71a797d7101fc22cb61af0fbea13301ae35b32a1908b1729e189c7edd5a2751
pdf-font-stream PDF embedded font (sfnt) at offset 0x7953 5384 bytes
font_01_sfnt_off00008b98.bin
93bfd8106b9b5bb69897a9808e1124d7697eda9faf29adb78588ce2ba5d07ace
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B98 10568 bytes