Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a16eea44d235920…

MALICIOUS

PDF

43.7 KB Created: 2020-08-25 19:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34870889ef4bbf9b18cc5ea0b0b87e79 SHA-1: 47236d872782e0e9194db2b3fc9598b2809fa645 SHA-256: 6a16eea44d235920a3329b33bc29fcbd6eaefd65bf3c9a2b1dfda0e54058567a
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=chicago+festival+guide+2015`. It also exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL and link farm behavior suggest an attempt to lure users to malicious or deceptive content.

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/pify?keyword=chicago+festival+guide+2015
    • http://files.ondemandinstruction.com/uploads/1/3/1/3/131381450/kisuraxulu.pdf
    • http://files.metrograniteokc.com/uploads/1/3/1/4/131453499/289b507.pdf
    • http://files.tsladventures.net/uploads/1/3/0/9/130969322/f1ff82c6b9ac.pdf
    • http://wisopo.ceciliabramhallart.com/uploads/1/3/2/6/132681268/4798312.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/55591246176.pdf
    • https://cdn.shopify.com/s/files/1/0429/4197/2646/files/15971127938.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesuwalaloluxafim.pdf
    • https://cdn.shopify.com/s/files/1/0428/6208/4262/files/17713435179.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/55657149573.pdf
    • https://cdn.shopify.com/s/files/1/0462/2106/6393/files/preliminary_mayor_s_management_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/fakuniruroramelurak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/bodobuwunuvobirado.pdf
    • https://cdn.shopify.com/s/files/1/0428/1162/1543/files/ganapati_atharvashirsha.pdf
    • https://cdn.shopify.com/s/files/1/0454/2916/2152/files/masomaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4229/files/tonight_west_side_story_piano.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_off000067e3.bin
83b21a3388c50fcbe1ca4c1ae0ed8bc9563139270e24d10b718f7d906663ee2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E3 5604 bytes
font_01_sfnt_off00007aff.bin
cd013aca68896733db4e05c53f8f8b198d042d42952fefa5cf8822702914a30e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFF 11616 bytes

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