Malicious PDF — malware analysis report

Static analysis result for SHA-256 343658006587cb8d…

MALICIOUS

PDF

51.0 KB Created: 2020-08-31 11:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dc5056fa4b3e9f066a000e9d6876922 SHA-1: f1d06deaf61777b8dab224bbdf57977550a6e4c7 SHA-256: 343658006587cb8d570d291707df5a2d2b73a9cce7e2b6340b5f09982e7b439d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to inflate search engine results or distribute payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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=shooting+stars+carol+ann+duffy
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d2751c_7c5e635fcde647e288b8391dde261947.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_bd1da6f575b0438593a5dd7e45cfa8cd.pdf
    • https://static.usrfiles.com/ugd/225520_ef259d29bcd542958b1a9af9d861da5f.pdf
    • https://static.usrfiles.com/ugd/469aea_a314ed670c494184892534bf66abaa13.pdf
    • https://static.usrfiles.com/ugd/d99ef3_62f7b5a5634e4e4a9ecef17e1a323c4c.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/nusiwusolirewevaxakovaget.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4968/files/40300161615.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/xoxupubovesukubi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/17167214529.pdf
    • https://cdn.shopify.com/s/files/1/0463/3372/2785/files/gloomspite_gitz_warscroll_cards.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/76587319866.pdf
    • https://cdn.shopify.com/s/files/1/0459/6213/3663/files/zotapajeniwev.pdf
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/85656935442.pdf
    • https://cdn.shopify.com/s/files/1/0428/2646/5436/files/6945794588.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_off00008bdd.bin
9573eed3dfe01f29359d521b7b50ec972f5bd110efa9dc1a06e2ea737df4c3af
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDD 5488 bytes
font_01_sfnt_off00009e77.bin
337ee3116e2135d02e3f0d3b5080dc86afea1796e6006158c61647cb9f066666
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E77 9592 bytes