Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b583ea3ff77ba99…

MALICIOUS

PDF

45.9 KB Created: 2020-09-03 06:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5573a6d09f4d64cdac87b8760e5f6ec0 SHA-1: af1a50079637c32c0f646ec8128c88d038e9e345 SHA-256: 5b583ea3ff77ba9954e30a13350b270d75961ac739883c45ec6d793745bc6386
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'Java version 8 for windows 7' and the malicious URL, suggesting a lure to download potentially harmful software. The ML classifier strongly indicates maliciousness, and the presence of a link farm further supports 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.link/wix?keyword=java+version+8+for+windows+7
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/93971e_7cd2e5e05fa24c5597e535c12c703632.pdf
    • https://static.usrfiles.com/ugd/b914b5_fb52322a7052455481a5d5fa003d9e2d.pdf
    • https://static.usrfiles.com/ugd/d54300_6e47ea2e268d4b5e97074ef21ceffbb2.pdf
    • https://static.usrfiles.com/ugd/26481d_1c16ef1b81cc45229c28df4bfeeae144.pdf
    • https://static.usrfiles.com/ugd/ced2dc_e645ba48f1494e75b83a04a7eaf66a58.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4b4e6ad63e74aae84127cfbd282512b.pdf
    • https://static.usrfiles.com/ugd/98e298_b74cdeedf0304688a69fb766ccd0aed3.pdf
    • https://static.usrfiles.com/ugd/f84671_1c58fefb8c5f4935b5857496698adb81.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbc5d4d42aef426d9b0325a200230972.pdf
    • https://static.usrfiles.com/ugd/362633_573c55ae70de47fcbd1b08906c98a888.pdf
    • https://static.usrfiles.com/ugd/48f461_1c498b2b472f4c51bb35adbb944c3c0a.pdf
    • https://static.usrfiles.com/ugd/b1277d_a5e2d2dbba1e4615a96857f757a45291.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/xowibinirodatutegavemix.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0839/files/winoridufozimaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/budajatetitajudegovagipom.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_off00007542.bin
1c224832aab711c2a4f8768cc143868f088a60f78593928a6bdb53ac18e10c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7542 5284 bytes
font_01_sfnt_off0000876c.bin
ab1d121d568c41c0e8b40a05129a2f0f9a3667c9c4b2c3982984dd2a5176a9c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x876C 10312 bytes