Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f4416f25120a38…

MALICIOUS

PDF

36.8 KB Created: 2020-08-30 23:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f3adfb2cac0bf559f8169a138662786 SHA-1: 5c613d405fd1551d3b488ae7278245fafb881ee5 SHA-256: 65f4416f25120a38516ef1869ded4c4768c23c41bb4fa89a8fd70d1fee6d1477
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'maths for 8 year olds worksheets' and the malicious URL. The presence of a malicious redirector and a link farm suggests an attempt to drive traffic to malicious content, likely for phishing or malware distribution.

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=maths+for+8+year+olds+worksheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_14f1dd89131c460bb4c0268c1c5dedf3.pdf
    • https://static.usrfiles.com/ugd/008e52_c4200eba42984757a28bd9ba0bec3fbf.pdf
    • https://static.usrfiles.com/ugd/88a84f_7214afa992314cf2b1d6191b7bf65c37.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecca9774b4e14120a00f63ae7b267244.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2661/files/43739000638.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/.pdf
    • https://cdn.shopify.com/s/files/1/0439/1328/1688/files/84302411768.pdf
    • https://static.usrfiles.com/ugd/b8c837_6611383f101e4964bd06c5f8bab29af1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c40bed4106164791b4c1f9a8b5d2d4de.pdf
    • https://static.usrfiles.com/ugd/1decf9_53d78fc6a0b340e9a846e2d930571c57.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8247b8008014c66982ddd0acc608df6.pdf
    • https://static.usrfiles.com/ugd/10b11f_bdfbdd1571524a5187b90abddb80d43b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f19988edcee4f85a9c29f7c89c210ff.pdf
    • https://static.usrfiles.com/ugd/5b604d_97e02053cba2402bb0d8a6b959679836.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_off00004ea5.bin
9775729e20445184c32e00c1dd0a5ef6967e9d517c7701a727f7c7251e51fefc
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA5 5452 bytes
font_01_sfnt_off00006140.bin
c241a845c02547006587c5157e0d3997675cfe4dd4e96b1f5d521865167dcf0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6140 11268 bytes