Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7807e759501c60…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 00:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a07c0991d407327f2cb820bb8f2992ba SHA-1: 4535c5213bf995c4f70ffc004b15ed9e445d990f SHA-256: 5c7807e759501c60cebe47a43ad207f9bb03194e90afe5a722519ce8b983ee50
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the URL and text that could be used in a social engineering lure. 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.cc/wix?keyword=interim+inspection+definition
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/921909_e6bd5a04ace446219129bac558cc9cf6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d14c48d4c1664a3da4a58274d6d36e87.pdf
    • https://static.usrfiles.com/ugd/d3758e_e14acdf598724502ad31f09be0220d8c.pdf
    • https://cdn.shopify.com/s/files/1/0434/8080/9625/files/kopeni.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/debafezaxosowomugisaxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/modupezekewibero.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vepotarinaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/vukutarozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5516/1252/files/guzurexizupojapazejas.pdf
    • https://cdn.shopify.com/s/files/1/0463/2490/8193/files/27859811552.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3799/files/81931411374.pdf
    • https://static.usrfiles.com/ugd/3b47cb_a5c2a2e964b34ef596999619c42b5146.pdf
    • https://static.usrfiles.com/ugd/ac51ce_00cec5b542e54de4adfd684aef21c922.pdf
    • https://static.usrfiles.com/ugd/b8c837_d21579b3702248fe8052b3cb6aa524ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_42246c1f7e694986bcaaca0ab1f366a2.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_off00006c47.bin
b82dec9da873f00b9e2b8eccad647e199ed61cfae580ebe4161dba563ddcbfbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C47 4996 bytes
font_01_sfnt_off00007d23.bin
f80168053f83cc4913a60a37c92666e78edde28152ba8bab9d4c67929fa3cc13
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D23 9984 bytes