Malicious PDF — malware analysis report

Static analysis result for SHA-256 32af2d59d0a85497…

MALICIOUS

PDF

45.6 KB Created: 2020-09-01 05:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eadd0fcab4366c5be824a1f35f1f9878 SHA-1: e84d374f4f71e554fd3841772235f6fe6b8b03e3 SHA-256: 32af2d59d0a85497f5b2f94d1d6c9bfd3dda885e7ede03bba8cf3621f3344b70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=bed+sheets+walmart+twin'. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to product searches. The ML classifier also strongly indicated maliciousness. The PDF also contains a mass external link farm, suggesting a spam or SEO poisoning campaign.

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.cc/wix?keyword=bed+sheets+walmart+twin
    • https://static.usrfiles.com/ugd/eaf48f_c65480855d644eca9b61381ec77cb53a.pdf
    • https://static.usrfiles.com/ugd/0df15e_9012e789d34240a49cbb1187ee298a65.pdf
    • https://static.usrfiles.com/ugd/a382ee_c3e29fb78f6e4b24b0e1140e18292524.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f30ef273b844e8db05031206df031d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_905df093d5004ff2890dfef871bb503e.pdf
    • https://cdn.shopify.com/s/files/1/0429/1667/5740/files/92205697312.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/kobubovuregovibedawatexuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1217/files/the_blast_furnace.pdf
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/40977509520.pdf
    • https://cdn.shopify.com/s/files/1/0434/7533/7368/files/43673969049.pdf
    • https://static.usrfiles.com/ugd/b8c837_91f77b957d3846caad2053f2accffe7b.pdf
    • https://static.usrfiles.com/ugd/4d935e_ffba2123c6234f30a114bb7965fe78d0.pdf
    • https://static.usrfiles.com/ugd/7198c1_734b7a7f7eab4f8d99dc90082421b0ca.pdf
    • https://static.usrfiles.com/ugd/f84671_1a94766feb5a45409fe3b750e35fd60a.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074be.bin
f6509440b2280cf97f4ea90624cd0c5ff88401cab7ca8ee3c0ebc5f0d1b8aeee
pdf-font-stream PDF embedded font (sfnt) at offset 0x74BE 5208 bytes
font_01_sfnt_off00008658.bin
5114da977f9953d531ee30eae37409e7813525acc29e89ac5fbe01682058a1fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x8658 10424 bytes