Malicious PDF — malware analysis report

Static analysis result for SHA-256 93495baed6f4b9c5…

MALICIOUS

PDF

44.4 KB Created: 2020-07-09 01:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db8fbf76b9711d9cc9f9727bd4086190 SHA-1: b87a87de6eb44d3e5bfeca3f6ac4a53df180c3f5 SHA-256: 93495baed6f4b9c580c59cd3aed080975399b4e7ae205a2ab864f50a7390e36f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a redirector to a known malicious domain and a large number of links to SEO-optimized PDF files hosted on various domains. The document body, though partially corrupted, contains text related to 'statement of financial position definition pdf' and the same URLs found in the heuristics, suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly indicated 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.cc/wb?keyword=statement%20of%20financial%20position%20definition%20pdf
    • http://files.theroute92.com/uploads/1/3/0/8/130873973/zuguxizamuri.pdf
    • http://files.aerlab.ca/uploads/1/3/2/6/132695569/medogu_lovitew.pdf
    • http://files.carinekeenanmft.com/uploads/1/3/0/7/130775392/lafegaxe.pdf
    • http://files.joseluisperezjim.com/uploads/1/3/1/3/131383553/gejuxab.pdf
    • http://files.houstonkickstarters.com/uploads/1/3/0/7/130775371/nedajuxefenatew.pdf
    • http://files.francismakemiepc.org/uploads/1/3/0/7/130738951/2699313.pdf
    • http://files.jimpendergrass.com/uploads/1/3/2/8/132815961/xabixejeje-nenowapiwage-jisematonalon.pdf
    • http://files.rachelgrubbmusic.com/uploads/1/3/1/3/131379868/zigefurovafiva_xirebeter.pdf
    • http://files.minilivestock.com/uploads/1/3/2/7/132740415/38a223c.pdf
    • http://files.closets-now.com/uploads/1/3/0/7/130776123/08f989b828dd6c7.pdf
    • https://sudomabu.files.wordpress.com/2020/06/835135170.pdf
    • https://sogifefuve684083845.files.wordpress.com/2020/06/44655031306.pdf
    • https://zafugetizif.files.wordpress.com/2020/07/wobakijuvulosisonabunuji.pdf
    • https://zisosaxevesi99562676.files.wordpress.com/2020/06/beriniw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68513135127.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fbd.bin
d90a64973b9c755784686db8e9c680f0da51374f3bb8bd034a2e63c7ef35c508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBD 5096 bytes
font_01_sfnt_off000080f4.bin
49e9447015b2f9e23efd3cf92996ad0091b58b38c749f54990c70e3ccd18fa3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F4 10392 bytes

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