Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0adf02f58252e1…

MALICIOUS

PDF

38.5 KB Created: 2020-08-30 08:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 673168f0e46152e87d2e28f09254748b SHA-1: 1a6f57413daeda52f1cc20ea1353660386df0568 SHA-256: 0b0adf02f58252e11e06b5df185c54146a9c301339bf1f563fdd53e929eb2339
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be link farming or redirecting users to malicious sites, disguised as study materials.

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=rehs+study+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/rerowebakejixodilezizudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1628/1512/files/vuwakanevij.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9383/files/used_vehicle_information_package.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/65654729317.pdf
    • https://static.usrfiles.com/ugd/67e251_d4a8c8725c61469b8cf340358a241883.pdf
    • https://cdn.shopify.com/s/files/1/0430/6701/5335/files/bojipapafamevivebi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/kid_cudi_pursuit_of_happiness_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/making_all_things_new_nouwen.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9443/files/93349321938.pdf
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/harry_potter_books_free.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_off00005743.bin
aa55199152469cadd68409a71b38d60ce4785aa3cd2aafff2b024eeb331ab8ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5743 4856 bytes
font_01_sfnt_off000067d0.bin
3ccaa4e428e204f7ecd853abc4043a77892ee7611def48a75b24526b3e9ddb6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D0 11196 bytes

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