Malicious PDF — malware analysis report

Static analysis result for SHA-256 814128ebcad447d4…

MALICIOUS

PDF

49.7 KB Created: 2020-09-12 00:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 015ccee9bb10bd8804e07cf11f73086b SHA-1: 98a9ab51c0b2286d7eec676345774bb91518999a SHA-256: 814128ebcad447d480267ca06611401329b661f75eccdffe3b13d6ea70088773
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a link farm, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious websites through deceptive content, likely for further exploitation or phishing.

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.club/wix?keyword=visual+studio+code+format+python+code
    • http://jakofafoj.pmteam.ca/uploads/1/3/0/7/130738711/50816c.pdf
    • http://parisudop.securevisionmediasolutions.com/uploads/1/3/2/6/132680835/rufavanav.pdf
    • http://files.thecramm.com/uploads/1/3/2/7/132740270/f0f66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a9248e_e763a452ec3e481e8ead920f860432f7.pdf
    • https://static.usrfiles.com/ugd/6fd45c_e1721187173b478aade4b986e6d7162c.pdf
    • https://static.usrfiles.com/ugd/87a178_a1034392df0045c8aaf539bdec6862db.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e08d37e535c43a5b82f4c78f1e535e5.pdf
    • https://static.usrfiles.com/ugd/5b9a87_b766f1d231484b769706fed10895d2b3.pdf
    • https://static.usrfiles.com/ugd/665c20_b731972b3d4a4d768a4a4747657a5140.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a5744a1b30e48a28ca4e771fb670019.pdf
    • https://static.usrfiles.com/ugd/67f5f7_56109202cfbf42cf81a558fca79a822b.pdf
    • https://cdn.shopify.com/s/files/1/0429/8588/1753/files/bozifuwufiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5024/6039/files/80759160652.pdf
    • https://cdn.shopify.com/s/files/1/0438/0524/5597/files/76231050676.pdf
    • https://cdn.shopify.com/s/files/1/0435/1908/2651/files/black_fathom_depths_vanilla_loot.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068e5.bin
0e9660b832f9f1259245f4a6a4e68e68f9ea96e948d6804a38c8d78c6323a0e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E5 5460 bytes
font_01_sfnt_off00007b58.bin
4bf310595a888be03c7e451b6b4d22c68de4cbd6c391f53e58e095f6bdba1099		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B58 12192 bytes
font_02_sfnt_off0000a30c.bin
e12927bcd43f280d077d848c6a2458140bd1208675b6924976ed8e54012a164d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA30C 16524 bytes

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