Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b482305a311dc8…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 23:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6f91b1ac04a11f1037561b11bf8d95b SHA-1: cd81216d2607a47b5caf8b399a9e48138f0a58fa SHA-256: 87b482305a311dc8c729c3e71d13a8750a4e019678a928b5dbe03a5b3ff4f811
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=rapport+de+stage+3%25C3%25A8me+exemple+pharma', is flagged as a malicious redirector. The document also exhibits characteristics of a PDF link farm, with numerous links pointing to external PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/wix?keyword=rapport+de+stage+3%25C3%25A8me+exemple+pharma
    • https://static.usrfiles.com/ugd/b8c837_e845fd0198bb4c04b1eee8f4c57892d6.pdf
    • https://static.usrfiles.com/ugd/c068f8_a1f3b6a90ae34cebbb994a397d9d8057.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_326fd397f3824e5cb414ddd7a09992d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1537bbddb36496ba8d58b19bf8e11e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e0839b1a2534d9abba6fd66bce1cfb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_6664b1be210a4483b4d4a3ef414dfdfb.pdf
    • https://static.usrfiles.com/ugd/b8c837_473a88f600f445a1aba8ba4fff4a6b36.pdf
    • https://static.usrfiles.com/ugd/cc03df_37619894e72f469b90ba0dc970fb8eb0.pdf
    • https://cdn.shopify.com/s/files/1/0435/7770/4607/files/ferowubupixikonibapoxubas.pdf
    • https://cdn.shopify.com/s/files/1/0436/4396/1504/files/madras_university_bsc_maths_question_papers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/tapenopolix.pdf
    • https://cdn.shopify.com/s/files/1/0435/1285/6731/files/recursive_sorting_algorithms.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e27.bin
eb39a65c9fcda0863d52aa0d57972781a08dab9a82bacadf359be1a0558e2692
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E27 5756 bytes
font_01_sfnt_off00007160.bin
ad461686f9f33a868869ce41c2a59c7c62a71941775767472b464d972c24412b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7160 11784 bytes