Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbf05a5f1b0f4fe…

MALICIOUS

PDF

36.8 KB Created: 2020-08-29 10:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da940b7e89e026de8a27650577565bc9 SHA-1: e50fc3d0270004a59d34ba659db4d7785752cb40 SHA-256: 7fbf05a5f1b0f4fef774c6528f98bbc8ea6681668a9018a4f447d0a0fe4cece1
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used to redirect users to malicious websites. The document body, though heavily obfuscated, contains text suggesting a lure for a 'mine wars texture pack download' and includes the malicious URL https://ttraff.com/wix?keyword=mine+wars+texture+pack+download. This URL is flagged as a known malicious redirector. The PDF also exhibits characteristics of a link farm, with many external links pointing to various PDF files, likely to manipulate search engine results.

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=mine+wars+texture+pack+download
    • https://static.usrfiles.com/ugd/b8c837_a95dcd60dad24294a2f51166a310db03.pdf
    • https://static.usrfiles.com/ugd/b8c837_d480769a35384017974c1bb12043c8d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8e95e2013994364bea4f705c4d6cb64.pdf
    • https://static.usrfiles.com/ugd/b8c837_8298f1fa6bdb441c93f0ece271c65248.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2959c0194ca4f3ebcb6af47b4d3808e.pdf
    • https://static.usrfiles.com/ugd/b8c837_33284a30091f4077a062a2edbcfe5c9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0e5f779e2c14160ace742a8223cfc19.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b6c745be44b4880b4906a0e94e2621d.pdf
    • https://cdn.shopify.com/s/files/1/0437/1048/0533/files/gas_scrubber_design.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/88069223144.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/nanevajemagedewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/11626430226.pdf
    • https://cdn.shopify.com/s/files/1/0436/6663/6953/files/abellio_greater_anglia_delay_repay.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/structural_interpretation_of_seismic_data.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2908/files/ruxafiwoz.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_off00005235.bin
dbfbd036a240e7c626e251ce5481d3c133d62f8121d58eb8a08644747e8c8e3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5235 5296 bytes
font_01_sfnt_off0000645b.bin
9ce48b07aea2f8ec404c6d3bd014109f2d98c4ec2e2a76cc766c46fe75cdca56
pdf-font-stream PDF embedded font (sfnt) at offset 0x645B 10192 bytes