Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b56cbf804616f9f…

MALICIOUS

PDF

43.7 KB Created: 2020-09-01 10:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 784d3e69642da764b0f9369738c5e87a SHA-1: 679fcbdd94cbcdd3044b12a53f570bf0bea465d9 SHA-256: 5b56cbf804616f9f85948cf92a324a26025b38f86a66723b0f930b4c0840f8ba
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which is flagged as malicious. The document body, though heavily obfuscated, contains text related to driver downloads, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a potential link farm for SEO manipulation or distributing further malicious content. The ML classifier strongly indicates maliciousness.

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/wix?keyword=driver+asus+x455l+windows+7
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0439/3621/9291/files/bamoponajizugizedojiwetu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/wugubug.pdf
    • https://cdn.shopify.com/s/files/1/0463/4230/8001/files/17253259906.pdf
    • https://cdn.shopify.com/s/files/1/0432/0129/8594/files/57404145708.pdf
    • https://static.usrfiles.com/ugd/15ebe2_98d7bf7183454cc88730c1031241745b.pdf
    • https://static.usrfiles.com/ugd/a382ee_7d288fe859d74a54888e53a755655668.pdf
    • https://static.usrfiles.com/ugd/f3cb45_108ffb5ba341496bacdfc021894888e5.pdf
    • https://static.usrfiles.com/ugd/c3f59f_a1baf3ac223c4da6b5e255bd4ea034c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_581ea006585b4ab29b69a9eaba43713e.pdf
    • https://static.usrfiles.com/ugd/fe83c3_602dc04c49e148a4a97c37e5cf4b076f.pdf
    • https://static.usrfiles.com/ugd/b8c837_32fe25f75ec94347bb927212096f365a.pdf
    • https://static.usrfiles.com/ugd/909b15_aa9e2055d49c449f852d79791cea0796.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_off00005fc2.bin
0571b5e72fe2a9db6662e80f7dc53a0d71cd72fda422f9c541447c32b0617f06
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC2 5328 bytes
font_01_sfnt_off00007222.bin
56ff29ef7ef882b1ea62ef7eb1bb91f3081b8e8a45cd3edff1ba6654b73cf8b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7222 15044 bytes