Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fc5ff54dd22c72…

MALICIOUS

PDF

32.8 KB Created: 2020-08-02 16:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae09ea0de3989481fd1befa42d139629 SHA-1: 2332af832b51a11794085d17fa92fb9f06d13d1e SHA-256: d4fc5ff54dd22c7238c184f18e2a637033506a9d8d69769d6c6e0de3ee60978b
150 Risk Score

Malware Insights

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

The PDF document exhibits malicious behavior through a high density of external links, identified as a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=how+to+move+channels+in+discord', is flagged as a known malicious redirector. The document body, though partially corrupted, contains text related to Discord channels and the tool 'wkhtmltopdf', suggesting a lure to disguise the malicious redirection. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=how+to+move+channels+in+discord
    • http://files.fertilegreenfarms.com/uploads/1/3/1/4/131409498/wobafipof.pdf
    • http://files.athenas-owl.com/uploads/1/3/1/3/131378975/f73489e38c.pdf
    • http://files.georgelibermanphotos.com/uploads/1/3/0/7/130740130/0ab3de3648.pdf
    • http://files.twistedtangerine.com/uploads/1/3/2/6/132682295/a23c91fe5c23.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/24928261399.pdf
    • https://cdn.shopify.com/s/files/1/0430/9513/0266/files/mirujazawasofamuvorawiso.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/pawupodepavikowigimizere.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/8509302142.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/88691902272.pdf
    • https://cdn.shopify.com/s/files/1/0430/8100/7255/files/convert_to_rtf_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/56128342936.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/21957632907.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/42801756419.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/nuzelonubog.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/59009345535.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/abandoned_projects_in_nigeria_pdf.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_off0000455f.bin
56929027f45e18894e8471db053c030d8db5490a39805ebde390444e48bd81e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x455F 5292 bytes
font_01_sfnt_off00005745.bin
6ce57987464a87f97398b480604d2d1d335de9ec4215e74dab3e04cd1dea76ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5745 9180 bytes

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