Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ae9c7d3fa5bf62…

MALICIOUS

PDF

40.3 KB Created: 2020-08-11 08:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea6b83343adaa93769de3bd177adf6d3 SHA-1: b0196371061b2675f52c1d38968766e3d1d7e196 SHA-256: 75ae9c7d3fa5bf62d76b6bbc883218edab9540c2a7ce334c5fc51aab5f9a7f79
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm. One of the primary links directs to a known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body itself is largely garbled but contains the target URL and a reference to wkhtmltopdf, suggesting it was generated programmatically.

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/pify?keyword=diferencias+entre+estadistica+descriptiva+e+inferencial+pdf
    • http://files.zovest.com/uploads/1/3/0/7/130775952/9003b52d.pdf
    • http://butow.spicepeppergarden.com/uploads/1/3/1/3/131381489/vuxidudowoxazutarano.pdf
    • http://files.mymothersbasementgallery.com/uploads/1/3/1/4/131407459/1347856.pdf
    • http://files.hautedogs707.com/uploads/1/3/0/8/130814288/91f210366dd.pdf
    • http://files.lemonstreetgallery.org/uploads/1/3/0/9/130969754/lawabajajidu_jodamika.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/telopopikajedufolazutefir.pdf
    • https://cdn.shopify.com/s/files/1/0433/2896/2715/files/81499812485.pdf
    • https://cdn.shopify.com/s/files/1/0434/7795/8816/files/82257355424.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/luzajimame.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/1998173539.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/collections_class_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/vupusedipegug.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/driver_san_francisco_mods.pdf
    • https://cdn.shopify.com/s/files/1/0437/7182/2229/files/nopufifinazufogetilepub.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3556/files/miziwadudama.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_off00005cc3.bin
7e4d23ad2d59d98a6a5f2bce2ec1fdab15b00329b11efb4cbf6d9d176b8f29f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC3 5208 bytes
font_01_sfnt_off00006e8d.bin
922dd9245c08ea180080efb77b42daec020313bde52a705a47cc01fbffb094d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8D 10900 bytes