Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a91d1f2db6ccd9…

MALICIOUS

PDF

42.3 KB Created: 2020-09-05 14:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dba314aa9e1ed94f677228ef70f61fd SHA-1: 96ac93745b0b49bc3e769a98ec1f9b5a29003aaa SHA-256: 70a91d1f2db6ccd95d2f2129a6d584e10773974619db3ac56379a37821ec7581
154 Risk Score

Malware Insights

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

The PDF document contains a deceptive title and body text masquerading as an employee background check authorization form. It embeds a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent.

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.me/wix?keyword=authorization+form+for+employee+background+check
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9f6a24_42b384c01be248cbad65c5d5fc8e6a30.pdf
    • https://static.usrfiles.com/ugd/c34aa9_defc9056af0b4b3ea2fc4a133e2de07b.pdf
    • https://static.usrfiles.com/ugd/a4c1fa_0fabaf1c27274927a1585c758730f792.pdf
    • https://cdn.shopify.com/s/files/1/0430/6137/9221/files/ecotourism_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/7156/1116/files/52171857830.pdf
    • https://cdn.shopify.com/s/files/1/0427/5548/9948/files/rikijituwipebesizog.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/72975400919.pdf
    • https://static.usrfiles.com/ugd/740d8c_c9b813873fd6415cb74ffb88bb8e0e28.pdf
    • https://static.usrfiles.com/ugd/724bd4_60d588b81a984d6286993c0767e25ea6.pdf
    • https://static.usrfiles.com/ugd/43d598_47091f19e6744cec9c986d39351c6b47.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/sadesimowamubub.pdf
    • https://cdn.shopify.com/s/files/1/0440/8334/7606/files/princess_and_the_frog_story.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/jojiloxitokelepexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/forewoselazeb.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_off0000669d.bin
3c098d687afec8a8fa4570dc12925a1c859c3e043b94dff7f8934dae4e926e4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x669D 5736 bytes
font_01_sfnt_off00007a07.bin
90e36cf4fd5e202c26bc732264335b8d4503e2cce98bf7410df1556c71c6a69c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A07 9996 bytes