Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f5d29b2741ea4e…

MALICIOUS

PDF

34.5 KB Created: 2020-08-29 20:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 183e46ffe566cba0fb23df44700f4b38 SHA-1: be76ceb08d56d3aa51ebaa7d5cf9aa808d3a11cb SHA-256: 65f5d29b2741ea4e55aa6051a1796c5baafa79d7d49d0d26eb27c0d57c18ca1a
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a redirector URL that is flagged as malicious. The document body text and heuristics indicate a lure for free content, likely to drive traffic to malicious sites or download further malware. 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.com/wix?keyword=current+issues+and+enduring+questions+11th+edition+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3521/3467/files/rigusokexavixoruteb.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/95380264732.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/dupelinetaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1152/files/sajokodaru.pdf
    • https://cdn.shopify.com/s/files/1/0436/8557/6857/files/free_in_app_purchases_ios_no_jailbreak.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb48bc14073742f5b99a8a1be09554ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d0e11fb6cf43d29792f026b4d63c22.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5072/files/fekuguwisakanu.pdf
    • https://cdn.shopify.com/s/files/1/0464/7177/4366/files/ipad_2_latest_software_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/8392/2585/files/36853059906.pdf
    • https://cdn.shopify.com/s/files/1/0457/5130/4348/files/portfolio_one_page_wordpress_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/jubagol.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/words_with_periodic_table.pdf
    • https://cdn.shopify.com/s/files/1/0432/9766/9278/files/98803426106.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_off000048c9.bin
551dabbf991d381340d4577379e984a819807afaef3b89a942d4546e799f467c
pdf-font-stream PDF embedded font (sfnt) at offset 0x48C9 5344 bytes
font_01_sfnt_off00005af9.bin
5e8602772dc3fa4d22eb9034ae54c4047765a5e4565a4722f2353f3c4309cdee
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF9 9912 bytes