Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f40d44f5f4c4fd…

MALICIOUS

PDF

45.6 KB Created: 2020-08-30 13:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb38768d6eaaf1f615988bbb89cbe309 SHA-1: e009461b881c77d92dd3c5bb57688d619e030267 SHA-256: 57f40d44f5f4c4fdc04d1f037fed2240a304076669e272704dda16cf9549d614
154 Risk Score

Malware Insights

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

The PDF file contains a prominent link that redirects to a malicious URL, disguised with a seemingly innocuous keyword. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and other benign-looking PDF links, suggesting a link farm or redirection tactic.

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=suite+life+of+zack+and+cody+pizza+party
    • https://static.usrfiles.com/ugd/599f1c_2bbdba3e17754e058be47119bcc51ae1.pdf
    • https://static.usrfiles.com/ugd/0adedf_fad437222fbc4b77b8b77a5532af7205.pdf
    • https://static.usrfiles.com/ugd/b8c837_55c95d7425094209b1bd0b0057209363.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/20782756537.pdf
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/24040169370.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarexomerowomowubufo.pdf
    • https://cdn.shopify.com/s/files/1/0464/6879/2478/files/vapasuzezuxiluvevi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2744/5398/files/maxad.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/sinhala_adara_katha.pdf
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/83657899145.pdf
    • https://static.usrfiles.com/ugd/b8c837_22cf1212154446df87a2a48f71669641.pdf
    • https://static.usrfiles.com/ugd/c1108c_b854136b3ed04139a2507e796f585f52.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b57079a03574ee384b79c52a839f77f.pdf
    • https://static.usrfiles.com/ugd/3aca14_363e488102434051a24c3b9fd049aa65.pdf
    • https://static.usrfiles.com/ugd/b8c837_30bda6cbade347fe9b4b4577d96426f8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006759.bin
c9090d362a4da59ae915136bb3e56889c27f5e6e7d24f1971ac91740aed05f08
pdf-font-stream PDF embedded font (sfnt) at offset 0x6759 5172 bytes
font_01_sfnt_off00007904.bin
7a7152363f60a30966ad8865f354888f0105079f613f0a4acbfee91626b22c7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7904 9952 bytes
font_02_sfnt_off00009ae9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE9 4324 bytes