Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0bc7d6eebd8b4f…

MALICIOUS

PDF

40.0 KB Created: 2020-08-23 17:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efa44bfd0c8f2a677efb2dfbc8a7f092 SHA-1: 1b10334b53c8077884d84f578fbfc2a834eda529 SHA-256: 5f0bc7d6eebd8b4f2fa0b511ab5ff25b3b644d99c9f7c5ab4ba0d6fe9988a053
154 Risk Score

Malware Insights

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

The PDF document contains a lure related to woodworking plans, but it embeds numerous links, including one to a known malicious redirector. The ML classifier strongly indicates maliciousness. The embedded links likely serve to distribute further malicious content or phish for information.

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/pify?keyword=woodworking+bench+plans+pdf
    • http://files.chorus-tube.com/uploads/1/3/2/6/132682040/be2cc550.pdf
    • http://files.kaylabegay.com/uploads/1/3/1/4/131453215/1662760.pdf
    • http://kuwebe.centerpointschool.org/uploads/1/3/0/7/130738962/nokonata.pdf
    • http://files.madeleinefinley.com/uploads/1/3/1/4/131454040/kexakuxixeden.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/valkyrie_profile_psp_iso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/rugowopaborakuripo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9308/9692/files/12498934690.pdf
    • https://cdn.shopify.com/s/files/1/0431/4834/5500/files/46034547950.pdf
    • https://cdn.shopify.com/s/files/1/0440/7151/8373/files/4978278529.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/nigonobodu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9969/files/girexotaxivulojawazevabuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/vixofijawobajijil.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/2015_mustang_gt_auto_vs_manual.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d91.bin
fda41b7e8a34044284b324afcd2d727cae0e02e7fbdab370516bcd3e4017b589
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D91 5724 bytes
font_01_sfnt_off00007125.bin
4d9665be189aa76c165261c27d8b7f5682a6abbf005f29bcdfb5fd1bd5a903e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7125 10008 bytes