Malicious PDF — malware analysis report

Static analysis result for SHA-256 648b617ab0b67afb…

MALICIOUS

PDF

43.2 KB Created: 2020-08-29 02:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b36d91d054c2acf66d897ccc13fb00b7 SHA-1: 5588210d82afd8465596dbd2da5c0b6244a5d89d SHA-256: 648b617ab0b67afbc8f194384ffcc8cdb9b7f1371f904c167a9ac113fc4b9b86
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a link to a known malicious redirector, likely intended to lure users into downloading malware or visiting phishing sites. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, suggesting an attempt to manipulate search engine results for malicious purposes. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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=yowhatsapp+7.60+baixar
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_49e952bfa3ca4bfeaefa1e8e16a11836.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a94f739d6e941dbae269390221e042c.pdf
    • https://static.usrfiles.com/ugd/b8c837_58698c06fa6840518f5369d122e9ed50.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f776df66d0d40f7ade6c47fe730638f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce054c7d533441bb908d312701f67b71.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/xotanekubus.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9137/files/99414213212.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cb973119c11473c929f99e9e82a0979.pdf
    • https://static.usrfiles.com/ugd/b8c837_328ba79e8b9c409bb4f14e594c119880.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca2df2f0f808489db5c19d4d4ae21ff4.pdf
    • https://cdn.shopify.com/s/files/1/0431/9340/1501/files/90145081226.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xixuvedivikeror.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_off00006987.bin
20ef74b5ca5f86d311ea6c2a12ceeab369c131f759d230773c1224f19ef67829
pdf-font-stream PDF embedded font (sfnt) at offset 0x6987 5544 bytes
font_01_sfnt_off00007c7f.bin
596061908333574555f65467864ae24a62327f5665538a8d68ac402083091d43
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7F 10824 bytes