Malicious PDF — malware analysis report

Static analysis result for SHA-256 1889a5eaab1ed34d…

MALICIOUS

PDF

39.5 KB Created: 2020-08-29 18:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43021af4662484ea5295b9ae7a13e9e2 SHA-1: c8ab7f4753f12ca9ed909d265f4da8ce51dbcd34 SHA-256: 1889a5eaab1ed34d750acbc9f6771110eff867512d66ba782aeb37353afcb9bf
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for phishing and malware distribution. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to obscure the true destination. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings point towards a malicious document intended to redirect users to harmful content.

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/wix?keyword=culinary+fundamentals+book
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/de65f7_4cf7309de43b4b728196ec91ee13ab80.pdf
    • https://static.usrfiles.com/ugd/b8c837_093474b3ac45464aa9073fb644ee5b99.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c0ff9be2dd34bbea5a35923720e707a.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1752/files/vinayaka_katha_telugu.pdf
    • https://static.usrfiles.com/ugd/b8c837_76bac145d3f942f5895190352fac18c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e25ee465b3d428b8809d408e3070812.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/36779277076.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/gudutifawukol.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/trustworthiness_in_qualitative_research.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/28886949886.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_off00005c10.bin
607001c6efc3978367cacdfd6255e092e773a8115aae83dcbb1ef8ad10aba3f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C10 5264 bytes
font_01_sfnt_off00006ddf.bin
6ec5608a78b06f9bd705aadbe04d0f25288c6a7900796d93aae976c1d22ba81a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDF 10412 bytes