Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b35b3a49299cbbc…

MALICIOUS

PDF

51.2 KB Created: 2020-08-30 08:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5711e51fdc016bec0c3d7a22bca86831 SHA-1: d5b0746c7dafa2086680d07ce087132b0e8300cf SHA-256: 0b35b3a49299cbbc34dbb647bae18c5b84930172d0da21aa330e8da731853fa9
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is disguised as a search result for a specific document. This link points to `https://ttraff.ru/wix?keyword=human+anatomy+and+physiology+laboratory+manual+12th+edition+pdf`, which is flagged as malicious. The document also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates 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.ru/wix?keyword=human+anatomy+and+physiology+laboratory+manual+12th+edition+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d55797_763b14273b0c478c98788ac517d21978.pdf
    • https://static.usrfiles.com/ugd/238140_40d99541003743a283f90b7aa6cf2546.pdf
    • https://static.usrfiles.com/ugd/7dd30d_576008520ab7452d9993f4918ee5b28e.pdf
    • https://static.usrfiles.com/ugd/6240f8_7e4612b166ae4cf48b37a6162f349eb1.pdf
    • https://static.usrfiles.com/ugd/39cb9d_183ae47b86a64322a38058ea1d9ef410.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c5064a05d2f46b4ac596c50e7c9ba93.pdf
    • https://static.usrfiles.com/ugd/b8c837_0290c34a565b478597ee0ac5c323539c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2dd31e295c840e3af053e1176413e6c.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/rinexigavowufi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/logowiritano.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/fesojovugup.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/xuwipubiwufelibimaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5435/7910/files/88702443740.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/dejowuriwusawume.pdf
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/christmas_word_scramble_worksheet_with_answers.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_off000084d2.bin
d428814636cc4aabc7f8401c9d1e020e24327cdf86aba6952963affbdc809569
pdf-font-stream PDF embedded font (sfnt) at offset 0x84D2 5844 bytes
font_01_sfnt_off00009888.bin
4d871315236222b7fb65615e3cbfe854574c6974a7cf321b83c61c9267b49f32
pdf-font-stream PDF embedded font (sfnt) at offset 0x9888 10788 bytes