Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec1e9195dc94137…

MALICIOUS

PDF

50.0 KB Created: 2020-08-29 23:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09985de46c0dfd0a8e72c68b1e7d2497 SHA-1: 0d60050260d1122893dd392e1cb737baceb86d66 SHA-256: bec1e9195dc94137f8571659448b75bdb545a95080cebac7b68c335250a6f32b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.com/wix?keyword=evaluation+les+solides+cm2', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and appears to contain the same URLs.

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=evaluation+les+solides+cm2
    • https://static.usrfiles.com/ugd/9e14ca_06d2fb8b8f104b518f21e450ad8212e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f19fccfaa3946ce9e5e591fb39577f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e932bb83e56f44c2acd3c97be955dd67.pdf
    • https://static.usrfiles.com/ugd/24853a_8ca5316c5a184466ae60c54453fd7236.pdf
    • https://static.usrfiles.com/ugd/8d57bd_6ac47b8441a548d4a703800d357d2dce.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fdb5595d6d84fc2bf094d40cd297c78.pdf
    • https://static.usrfiles.com/ugd/b7306e_329837c2e3d848278fecbbfb1e3e2ee9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b304b755c669477392187141c0bdb4fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_c348125c14e743af95484c08f42a5667.pdf
    • https://static.usrfiles.com/ugd/b8c837_07d0c78823af452eb49be98f48523b22.pdf
    • https://static.usrfiles.com/ugd/de65f7_089144b0efc14cae807a93230054c273.pdf
    • https://static.usrfiles.com/ugd/b8c837_0520b94c0f5e4d7682e4512e462c7469.pdf
    • https://static.usrfiles.com/ugd/b8c837_c70c5fef769446a9a699c2997dc841cc.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4254/files/17058094462.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/57742282361.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dfd.bin
132b2f843dbe6e95cdf3a9e46eeba1cd155b32cdf67561bba8aaf72b965f8f1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFD 5020 bytes
font_01_sfnt_off00006efd.bin
80c687e815b2b3809d5a1f377016a5a9c1cbce157f5129f3fe0d229cd8e5027c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFD 12280 bytes
font_02_sfnt_off00009552.bin
f267a97a42ed964490c0c36cf8d24d30f5cfc386ee24850e75bb3a4991f11828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9552 16376 bytes
font_03_sfnt_off0000aafa.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAFA 4324 bytes

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