Malicious PDF — malware analysis report

Static analysis result for SHA-256 518f8587086f4e9f…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 18:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d534f079091140ccada8ef5854085df3 SHA-1: ffdb86f214146b5f67f3150890c13a3d2f72ca89 SHA-256: 518f8587086f4e9f1872e120804331895e8c1b760489b47373307dee770aaa3e
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/wix?keyword=coping+cat+worksheets', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments suggesting a lure related to 'coping cat worksheets'. The presence of numerous other PDF links, many hosted on Shopify and static.usrfiles.com, indicates a potential link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=coping+cat+worksheets
    • https://cdn.shopify.com/s/files/1/0432/9567/0427/files/40193200214.pdf
    • https://cdn.shopify.com/s/files/1/0431/1639/6697/files/joful.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/wimananesivugidire.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/bsff_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/5024/6054/files/podugaguloxitaxibasutiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8155/5350/files/figalujujoguni.pdf
    • https://static.usrfiles.com/ugd/b8c837_e981f0564dc942ea90d5373a1c1608a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4aa6b52ad8c4f63ba4bd253b9a4b068.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f40be5bc94947249c1abfbd6357f31e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cb7f8b2e54842298383683189af6eff.pdf
    • https://static.usrfiles.com/ugd/58a813_139d5b516b294471a3186f55ecebdc2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c7a8624810c4fc7b5cca814b49d31e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ca6ecbbfc2341dfb0bd62308cb361a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_085437aa8ead483f82bd694a5c504171.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_43ff297b199a4e7faa7efee4a44bdf14.pdf
    • https://static.usrfiles.com/ugd/daca0d_365f26402abd449e969dd51ed30333a8.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_off00005fc9.bin
6090862b71f8cafdb6f04bdfb0d2890852b7128d413fb55b5415ef51c866f6a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC9 5224 bytes
font_01_sfnt_off000071a1.bin
dc62a9d9ec032e52c5fa099d1a4760a2e8802b0280108b62b156437ba293e2ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x71A1 10364 bytes