Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a990eda2cc6ae14…

MALICIOUS

PDF

36.8 KB Created: 2020-08-30 15:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c4d55caf4a91264926622f3e3edc1c9 SHA-1: cab24afdb36875eac1d88e50f1f6b846f4e9be12 SHA-256: 6a990eda2cc6ae1482f09ac24f8ee05ae6dda3682b1263e433aa4499100ac4d2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links suggests an attempt to direct users to potentially harmful websites, possibly for phishing or malware distribution.

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.com/wix?keyword=i+will+never+leave+you+sideshow+kara
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6aae4917859e4932aac2d8b100caaea6.pdf
    • https://static.usrfiles.com/ugd/98e298_9b1fa136e00e400290ca36e3b0b0e030.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_d76b38039584423fbe4177a43ae4d9ec.pdf
    • https://cdn.shopify.com/s/files/1/0428/0506/7943/files/40372108614.pdf
    • https://cdn.shopify.com/s/files/1/0437/0202/6393/files/14452964733.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/dubulosagiwimepopizulo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0448/6055/files/57354912090.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/guzadapokuxewezikarizonor.pdf
    • https://cdn.shopify.com/s/files/1/0431/7705/0272/files/vodixo.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_off00005365.bin
5b413c38cf1722f1e19123fbb87f00b0cfeb9573b246cacf47b6bea3e15bbb25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5365 5168 bytes
font_01_sfnt_off000064fe.bin
85d3de6fe4772c8df3d78cec9500f2f732c1fd6b970188b5bd8fd1cf371867bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 9884 bytes

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