Malicious PDF — malware analysis report

Static analysis result for SHA-256 665e4a3111714d31…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 04:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f904895bf46f52031f292ae925df38b SHA-1: 8ba233f01ab4d6e0247c10389dbaa5f6a469d9d1 SHA-256: 665e4a3111714d31e0dbc5f3a8ab8cd72c93193bdb35d341d5212f7d428dc252
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs hosted on Shopify, suggesting a link farm designed to obscure the true malicious destination. The ML classifier also strongly indicated 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=outlet+new+york+jersey+gardens
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1923/8562/files/bozodafifatenawafasewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7360/files/24049732110.pdf
    • https://cdn.shopify.com/s/files/1/0432/5644/7136/files/gajiwirekafowiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/fowekuvenekapa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9025/files/65021125092.pdf
    • https://cdn.shopify.com/s/files/1/0427/8507/9452/files/zapiwajobinulozimizatob.pdf
    • https://cdn.shopify.com/s/files/1/0457/3187/2934/files/ddos_prevention_guide.pdf
    • https://static.usrfiles.com/ugd/e3c460_ca609b4c478d4c4590f03cf9ab508731.pdf
    • https://static.usrfiles.com/ugd/accd1f_3298d6efb4db41c594e3ddb298864413.pdf
    • https://static.usrfiles.com/ugd/0f5b72_c403ddef9961414fbb23e8a9bd7b8187.pdf
    • https://static.usrfiles.com/ugd/76de1a_ac450ecc984d469e8852264694473ffb.pdf
    • https://static.usrfiles.com/ugd/2ac701_d218b4e1dfdc47e0bfcc867637c6c467.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f270386712642d7ab246af03b1606e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_e36b7e4a920346da937485d9921a63db.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_off00006535.bin
88750ef0128f9d01be9d903550d982848aeb615151b862d3373b882a7ffeb229
pdf-font-stream PDF embedded font (sfnt) at offset 0x6535 5356 bytes
font_01_sfnt_off0000779c.bin
41c0556b3baf2eea6bfa400801641c4af2153fa98af5e8464cb07675444cabbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x779C 10524 bytes