Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c323f3221ea13c…

MALICIOUS

PDF

40.9 KB Created: 2020-08-29 13:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e8b9d3deeff9328846fe06cf58cfcb3 SHA-1: 73224189157b5139ed0ea5348b9fe642222abc34 SHA-256: 65c323f3221ea13cb53e4e73bf8781cc60af75e1f8c3b852167ff69b96af2938
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/wix?keyword=view+old+tweets+more+than+3200, is flagged as a malicious redirector. The document also contains a large number of other PDF links, suggesting a link farm or a method to obscure the malicious destination. The ML classifier strongly indicates maliciousness, supporting the attack pattern of luring users to malicious sites.

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/wix?keyword=view+old+tweets+more+than+3200
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8bc87731a82d48708873da3b9bc1b9ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_c923e54655a84240a8895a5403bc3396.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbd1b390e60e4e74af14b6be7255507b.pdf
    • https://static.usrfiles.com/ugd/58a813_62d5103a4880413b8ec91ec874ed33ab.pdf
    • https://cdn.shopify.com/s/files/1/0454/1464/5928/files/edmentum_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0434/5017/1554/files/11826932102.pdf
    • https://cdn.shopify.com/s/files/1/0439/2668/3816/files/cardiac_catheterization_technique.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/8761108973.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/allegory_of_the_cave_explained.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0446/files/mexixapuxesakakozopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4500/3169/files/xatugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/37442049539.pdf
    • https://cdn.shopify.com/s/files/1/0429/1202/2691/files/26322585421.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/bubede.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/80698139197.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_off000060be.bin
6d17b6e91242ccd06edb6105be876d6f2c2276239580080e1c038334e1745853
pdf-font-stream PDF embedded font (sfnt) at offset 0x60BE 5560 bytes
font_01_sfnt_off0000738c.bin
ef335bb1abd2ff81312c8a4190b8d2629840d8d49e40d51f688137adf9b867e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x738C 10208 bytes