Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57c88d60a610d52…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 03:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f61f2ec030c0b5210f684da45e7295b1 SHA-1: 854aea97c206edb06ba823c8fe82ae63aa91acd2 SHA-256: c57c88d60a610d524ee65728fe978a092bae91f35cebfd715f3e26d9d96cb004
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a song download. This link leads to a link farm, indicating a phishing or malware distribution attempt. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded URL and heuristic firings are sufficient for this assessment.

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=beete+lamhe+song+download
    • https://static.usrfiles.com/ugd/ce0e6d_99f41c6c77614f68ae54c695aded81ce.pdf
    • https://static.usrfiles.com/ugd/9219f8_3314c76e9efd4afbb467cfa7c20d2216.pdf
    • https://static.usrfiles.com/ugd/2b25b5_2a43d802455048d0821959091cc9aed9.pdf
    • https://static.usrfiles.com/ugd/a298ce_c4b189177e894be0ad929c4dc6f999a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa89c02855b941628bacb9b8834f225e.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/wufilog.pdf
    • https://cdn.shopify.com/s/files/1/0428/5205/7244/files/stihl_fs_90_r_prices.pdf
    • https://cdn.shopify.com/s/files/1/0435/2416/1704/files/cambridge_english_readers_level_1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1688ae0d4854c749b564f0fb6d15fe0.pdf
    • https://static.usrfiles.com/ugd/221f3a_bb0897d2644a4104bc9a9c3018eaf008.pdf
    • https://static.usrfiles.com/ugd/b8c837_0155eac2e7b84841b4212094a8becbca.pdf
    • https://static.usrfiles.com/ugd/26481d_ae9a83e0ecbe4b0cb2b6147e7ec9747a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a0647911b0d47e5a14ad61988378200.pdf
    • https://static.usrfiles.com/ugd/89363e_bc40f269edee423b86409224281d30a6.pdf
    • https://static.usrfiles.com/ugd/097bd5_b3c6821e5a6b48b6b2b417348f52e528.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/b8c837_f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005702.bin
40056634f99ff4fb3d987add0a0b8aeaf2221a19e322dd15436b0d275ace04da
pdf-font-stream PDF embedded font (sfnt) at offset 0x5702 5284 bytes
font_01_sfnt_off000068e7.bin
5e28c2e969042a0a12b5c59247aa9792433952e8c5cba6c872ddd03d0a66cf42
pdf-font-stream PDF embedded font (sfnt) at offset 0x68E7 14648 bytes