Malicious PDF — malware analysis report

Static analysis result for SHA-256 48573244089d10b4…

MALICIOUS

PDF

32.7 KB Created: 2020-08-31 12:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecb801b21c1dc1ea97021d214149444c SHA-1: 78bbd4ee97ac4b936069e71bb7213ef710a4f056 SHA-256: 48573244089d10b4e507cdfcf3bc56c5c4cb92caf97f4c0c3e84686073a67a3b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=international+economics+robert+carbaugh+14th+edition+pdf', is designed to lead users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, suggesting a broader distribution or SEO-poisoning attempt. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=international+economics+robert+carbaugh+14th+edition+pdf
    • https://static.usrfiles.com/ugd/b8c837_3e917a9ebfc84f4cb7f12620469f7aeb.pdf
    • https://static.usrfiles.com/ugd/33a2e4_c68e0f1c50d14ddda7b1bdca8ab30f3c.pdf
    • https://static.usrfiles.com/ugd/fe83c3_ec64e6b6560b442b9fe914ae49df0a25.pdf
    • https://static.usrfiles.com/ugd/8b2c09_29f93bd9dd7c4bd1bf7a3d6ad7543ade.pdf
    • https://static.usrfiles.com/ugd/a8ca0f_acd40d4ba74c421fbc14f0d823f56914.pdf
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/povupemuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7534/files/3078868106.pdf
    • https://static.usrfiles.com/ugd/b8c837_d875d13cd1e6451d9ac5728e0dbfcc71.pdf
    • https://static.usrfiles.com/ugd/b8c837_293d7613a92c45e7a591d77c593d0adf.pdf
    • https://static.usrfiles.com/ugd/906e9f_a83e3962c9294d8e8d077db091b34a01.pdf
    • https://cdn.shopify.com/s/files/1/0431/3494/3389/files/addition_and_subtraction_worksheets_ks1.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/negipopuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/ludikizuxuxufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8978/0124/files/mosozedemutobanagepefisip.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_off000043ab.bin
b781cf5c02d946c79dd5cdc6828146c1310be13c171ab8474a3deb8c50d9574c
pdf-font-stream PDF embedded font (sfnt) at offset 0x43AB 5788 bytes
font_01_sfnt_off00005732.bin
2a46f80be7caa35650693df7e7f95ca7445dd680b245500bd51385417ecc43f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5732 8920 bytes