Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf65205a005f91c…

MALICIOUS

PDF

53.6 KB Created: 2020-09-01 03:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5623d0b498e4ceddc7f4d2fc9610b59 SHA-1: 7c18dfa99e48186549a4ff337ab2477b4c5eefa8 SHA-256: cbf65205a005f91cca4e8d8dda846a1b78dfa4d52f98ea32ff878fb00a4dd9be
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.cc/wix?keyword=definicion+movimiento+circular+uniforme+variado, points to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or conduct phishing operations.

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.cc/wix?keyword=definicion+movimiento+circular+uniforme+variado
    • https://static.usrfiles.com/ugd/69695d_f0ecd7db66ea47c692bda7a0d8b49b03.pdf
    • https://static.usrfiles.com/ugd/b7082a_26c2330031714c91b0bb48c626bce982.pdf
    • https://static.usrfiles.com/ugd/b8c837_546a959a32ee4409940b3e28b5af5737.pdf
    • https://static.usrfiles.com/ugd/eda9ba_7cc6e142a3504561ab91565aa6d5b018.pdf
    • https://static.usrfiles.com/ugd/ce14f3_f36b323d8a7b440b873e83931d05f86f.pdf
    • https://static.usrfiles.com/ugd/b8c837_93879a5317f44462a68c02a82ce7a5da.pdf
    • https://static.usrfiles.com/ugd/c1615c_a205b4c97e0a491080b40ceb7c2e0e15.pdf
    • https://static.usrfiles.com/ugd/10e3af_de1bd0cdd01741e29d5a4371981e9724.pdf
    • https://cdn.shopify.com/s/files/1/0430/5430/1338/files/96033405892.pdf
    • https://cdn.shopify.com/s/files/1/0445/5786/1023/files/biblia_hebraica_stuttgartensia_en_espaol.pdf
    • https://static.usrfiles.com/ugd/a76634_735a1ac7703540f695ff34083d251fa5.pdf
    • https://static.usrfiles.com/ugd/af0aa9_c453bf2698c24351ac80f5b906c63d45.pdf
    • https://static.usrfiles.com/ugd/1be480_b01b214f1ff841af8bb01ca659466b0b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000718a.bin
0da9155b45ebae1fccd4fbb998c565e3ccc80517a27f87e70457f5deb66f2661
pdf-font-stream PDF embedded font (sfnt) at offset 0x718A 5048 bytes
font_01_sfnt_off000082af.bin
d6c52d97666a1e5a1e3990c5060a086436834d524b97bcd6cc8555577a0090ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x82AF 15996 bytes
font_02_sfnt_off0000b43c.bin
80552f64688efc328af064f033f50d248f100c5c567f62a53dd1fb0aa81cea7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 16132 bytes