Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9c8141b04f5a10…

MALICIOUS

PDF

48.4 KB Created: 2020-08-15 23:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f391c3362c82ca6e63854eced05b82c6 SHA-1: 3c27dc5b6d20011af942e23c2279d46f32eb6ad7 SHA-256: bd9c8141b04f5a10a3fa49c1f6795bae94bf7453492401bf65d513ff39c0dd0f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'Mochachos menu south africa pdf'. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wb?keyword=mochachos%20menu%20south%20africa%20pdf
    • http://files.uesosu.org/uploads/1/3/0/7/130739076/gexoxigikagexadebub.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/35509808438.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/80453470621.pdf
    • https://cdn.shopify.com/s/files/1/0432/5195/7923/files/bivezusavevuzimulaladutu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1865/files/64648031474.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/alliant_load_data.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/8633809721.pdf
    • https://cdn.shopify.com/s/files/1/0430/3313/3209/files/mutofol.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a5b.bin
792cad70b6a03b70323105fe6fd3859e0a43eb18acaba949cb8a5603ca247805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5B 5368 bytes
font_01_sfnt_off00007c6a.bin
c858df80e9eda258b9315ea3cbd12405f70d652c1f75e838319c15eaab0fbd31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6A 2144 bytes
font_02_sfnt_off00008647.bin
d7cff70aef03bc840a942d7a60d5ad72bb30068d58b9618f0f04ac9530926307		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8647 14496 bytes

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