Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc86b22615e5965…

MALICIOUS

PDF

43.7 KB Created: 2020-08-30 01:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e509b2dfe8bef5e7662722081163ca8e SHA-1: 8804f1ea66e4ef0f0963b964d12b0ecac537fe5a SHA-256: bbc86b22615e5965ac9b6d456be7fee83ddf734f06c1485f5cd7c24c9e620d5e
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a significant portion of which point to a redirector URL (ttraff.ru) associated with malicious activity. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to lure users to malicious sites, potentially for credential harvesting or malware delivery.

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=biografias+de+los+hermanos+flores+magon
    • https://static.usrfiles.com/ugd/80c1db_97ff26a0c0d1430ea8cad59188305138.pdf
    • https://static.usrfiles.com/ugd/b8c837_1089c6a8614948b79ff195f8fdd50e4e.pdf
    • https://static.usrfiles.com/ugd/0c268c_d8565b56362449b5befc1d0408d61328.pdf
    • https://static.usrfiles.com/ugd/b8c837_efec9eb68e56477fb6a6a8eed6735244.pdf
    • https://static.usrfiles.com/ugd/299074_fa42e0c8b4e640f6a1acb917971ed41d.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5055/files/wewokaxutegazujazinewisa.pdf
    • https://cdn.shopify.com/s/files/1/0449/6814/9151/files/warafiderefazeluxes.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/36790974308.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/93317041788.pdf
    • https://static.usrfiles.com/ugd/516574_e9053570c1f440c79d1dee34296a8dc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_192eeac6ebaa4d09b818c75621880aa1.pdf
    • https://static.usrfiles.com/ugd/b8c837_905a349e35e3427d888c29e42dddf4a6.pdf
    • https://static.usrfiles.com/ugd/1decf9_62a2e2fc50524550b172ceaa69583504.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bb02df74e0c4388b2052b7cbe492e65.pdf
    • https://static.usrfiles.com/ugd/3e87bf_e87eac08051b473e985dedf21d3c4a7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd358dfc61e540668b4d35995bce5230.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_off00006aee.bin
0be21b17c84b19f683fef4f26a257719846dcc067f49e357ef7903c7cf62074d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEE 5368 bytes
font_01_sfnt_off00007d00.bin
d9293094310e02a9aa7c0dfc265ad26dbd7d664f28e14adcce3fad712b2f847c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D00 10788 bytes