Malicious PDF — malware analysis report

Static analysis result for SHA-256 7935eb8ad9a760f4…

MALICIOUS

PDF

41.1 KB Created: 2020-08-28 20:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65f04384e565cd5c1627b36c83f99503 SHA-1: d9e3d027970516285887dfa932f78c2504d6c0bc SHA-256: 7935eb8ad9a760f4dfe9575f0c3c9721845559a57ad147898c261a81605f0f0e
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign content, but one critical link redirects to a known malicious infrastructure. This suggests a link farm or SEO poisoning tactic designed to lure unsuspecting users to malicious sites. The ML classifier strongly supports the malicious verdict, and the presence of embedded URLs confirms the intent to direct users to external resources.

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=ejercicios+de+caligrafia+para+preescolar+2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_0a6e6c3af0e04fbc8a3a456fb6f199ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_d34207c01fbf4fe7bd429f977bf8b467.pdf
    • https://static.usrfiles.com/ugd/b8c837_496c8eb36ba64e1a8770a0d32e39d74c.pdf
    • https://cdn.shopify.com/s/files/1/0435/8009/6667/files/14106669711.pdf
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/sedatexujozixasagolifixi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5039/files/vidalia_onion_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0434/0216/6435/files/pozuxuladivotuzupupagamat.pdf
    • https://cdn.shopify.com/s/files/1/0466/3597/4821/files/adarsh_credit_cooperative_society_balance_sheet_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9137/8854/files/55349250584.pdf
    • https://cdn.shopify.com/s/files/1/0433/3984/1695/files/sokepajasugimelofemiwejof.pdf
    • https://cdn.shopify.com/s/files/1/0440/0896/4246/files/high_spinal_anesthesia.pdf
    • https://cdn.shopify.com/s/files/1/0437/7149/4554/files/74827053738.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/rafigulatuxinipiso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4320/0929/files/47676309864.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_off0000601d.bin
909d2a470392beb1f81a8afff835148f4694efd6b37b990e82fd3855d2daa16a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601D 5488 bytes
font_01_sfnt_off000072e3.bin
d68e10a995a106e1a090f2679ea6c5590a5cf45242a1f27670d5b3958d3ad83c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E3 10640 bytes

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