Malicious PDF — malware analysis report

Static analysis result for SHA-256 17db6eb923a5d12e…

MALICIOUS

PDF

49.4 KB Created: 2020-08-30 07:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c1cecc825ef6cd6ecc2b4c9fd42f4b6 SHA-1: c7d008e77cfc328e9836be3d7a60b61a164bfc3b SHA-256: 17db6eb923a5d12e02be379603ce48faec57d38a9e151d389797e88dd652b7fd
154 Risk Score

Malware Insights

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

The PDF contains embedded links and text that attempt to trick the user into believing it is a Rite Aid employee handbook, directing them to a malicious URL. The PDF is heavily obfuscated and contains a large number of links, many of which point to external PDF files, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness.

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=rite+aid+employee+handbook
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/83b1b3_52e035fee23f4ec2ae4a00ac114986cc.pdf
    • https://static.usrfiles.com/ugd/bb13a2_56b7e84d93b4432dbe85528412a499c0.pdf
    • https://static.usrfiles.com/ugd/d162e3_c7216ee2a2c54d6f8c9c47b7a1737f15.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f35e69666394c26ba122993f94d4a6d.pdf
    • https://static.usrfiles.com/ugd/9e53d4_ebe580b251794cb484430d145a614661.pdf
    • https://static.usrfiles.com/ugd/b8c837_57a055deee8445489e7134244864cbe1.pdf
    • https://static.usrfiles.com/ugd/b8c837_55e7767d0cdd483a97363b0b4daa3e13.pdf
    • https://static.usrfiles.com/ugd/63d3ad_087fa3457013427ebac3cd09dce3e543.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/gevufunu.pdf
    • https://cdn.shopify.com/s/files/1/0465/3459/0614/files/domozanivimetas.pdf
    • https://cdn.shopify.com/s/files/1/0447/8546/7558/files/oppositional_defiant_disorder_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/30696700327.pdf
    • https://cdn.shopify.com/s/files/1/0431/1043/2930/files/analysis_of_variance_excel_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007200.bin
aa79c30d47b866b1d40fb81138ae9ab507ceb48f6656af27194304af4aed6da6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7200 5024 bytes
font_01_sfnt_off000082f8.bin
67319b844e846f6c7dc7ea683fdc4cdb1773f4b0da8e91e6cdc784aa02614d9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x82F8 12196 bytes
font_02_sfnt_off0000aabc.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xAABC 4324 bytes