Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f35fa97c493f5cb…

MALICIOUS

PDF

43.6 KB Created: 2020-08-09 19:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15911f140a54990f4e5ecbded7e0374b SHA-1: 7d99b0c8e1423a2030574f58d82c68e6610d97d0 SHA-256: 5f35fa97c493f5cbd652a5733ffc5cc1930863e2f243c1965e0c73e8b085f0e6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to funnel victims to further malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise its malicious nature. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content or to distribute payloads.

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.com/pify?keyword=accounting+standard+9+icai+pdf
    • http://files.allergyeasyliving.com/uploads/1/3/1/8/131856380/346d6436.pdf
    • http://files.lisaguice.net/uploads/1/3/1/4/131453870/wowilozif-nakupakuzun-rezima-lozejiw.pdf
    • http://files.svhcva.org/uploads/1/3/2/7/132712072/79a4447.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/redofev.pdf
    • https://cdn.shopify.com/s/files/1/0432/8597/1112/files/app_secrets.pdf
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/paropexozazim.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5285/files/39842577399.pdf
    • https://cdn.shopify.com/s/files/1/0433/7814/7491/files/51092605024.pdf
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/fakexufavobedo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/peremubuxagiler.pdf
    • https://cdn.shopify.com/s/files/1/0432/7958/1352/files/vosunakovubuxuruzibowukez.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/tewatifew.pdf
    • https://cdn.shopify.com/s/files/1/0431/7786/9476/files/unique_list_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/1143/1838/files/automatismos_industriales_descargar.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_off000067ee.bin
548dd3417b86baf81b738df47ca25c30be6b5dfd8d5abd56bb5c5ab4017af0a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x67EE 5436 bytes
font_01_sfnt_off00007a7e.bin
db4c948386424a9e63aca482599274729f9c8ab96e5cd4e4ec66af9dd96daa59
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7E 12288 bytes