Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc1dc07d5965f2c…

MALICIOUS

PDF

40.0 KB Created: 2020-08-29 04:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd36b1baa192442a1d3e38e024bb6b25 SHA-1: eb0b9ae98c37e75add7a13000920f990d89a8d0b SHA-256: 8dc1dc07d5965f2c397a323e7a80a4343ca72abc070bc14c934623bc983d3547
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or SEO manipulation for malicious purposes. No scripts were extracted, but the primary attack vector appears to be the embedded malicious URL.

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.ru/wix?keyword=twinkle+twinkle+little+star+piano+mo
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/mebadavoxir.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1602/files/5630481260.pdf
    • https://cdn.shopify.com/s/files/1/0440/2751/0934/files/sacral_plexus_mri_template.pdf
    • https://static.usrfiles.com/ugd/b8c837_7766d10a3d1948df888cf8c94ca6f3d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7d1ee1b78a9442ca693c84e1bd26f27.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ebcb851fb5c48ef8590debfefe30567.pdf
    • https://static.usrfiles.com/ugd/b8c837_19dd197a03cd45378ade5602fba8d609.pdf
    • https://static.usrfiles.com/ugd/b8c837_be241b25173547148b0686a4914d5bcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b41ed9564edc49e481e31d1d9dac9b30.pdf
    • https://static.usrfiles.com/ugd/b8c837_358530d5d96745719cec97db95ba54e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c6cfa7d984a4ac385406df5d41039e9.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_off00005f7b.bin
78a955eea2baa130454d86661c4d3e6f81bd634684ed916b9c6ec076a8cc8ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7B 5072 bytes
font_01_sfnt_off000070b4.bin
9562a367e226a01f8cc2eefc752af91f8d6e57c4028e916e41e3d096bcff4f98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B4 10236 bytes

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