Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8644a854ae97915…

MALICIOUS

PDF

62.5 KB Created: 2020-08-18 23:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b06d966bbbece0799e3fec2e2dcf1971 SHA-1: b75e29b0edf53a3a07d08e1fe67739c123ec5686 SHA-256: d8644a854ae9791587e74902f0fb12e688a2bd5ba406faf27f6ae693bd02be46
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as 'Electronics interview questions and answers for freshers'. This link, https://ttraff.com/pify?keyword=electronics+interview+questions+and+answers+for+freshers, leads to a malicious site. The PDF also hosts a link farm with numerous external PDF links, many of which point to potentially malicious or unknown domains. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=electronics+interview+questions+and+answers+for+freshers
    • http://files.davidkanmd.com/uploads/1/3/0/7/130775623/b7a8c47fa12bac4.pdf
    • http://gawekuvad.neomoonart.com/uploads/1/3/0/7/130776078/pobezavomadisot-zemaf-givaxi.pdf
    • http://files.scissiocontrols.com/uploads/1/3/2/6/132695629/470927.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/mcdougal_littell_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8615/files/kendo_grid_footer_template_function.pdf
    • https://cdn.shopify.com/s/files/1/0431/7606/7228/files/bedowiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/29364549066.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/87876879130.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9892/files/at_t_directv_channel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/pituwuwow.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_off0000b792.bin
546fb39facd4b34cfa7bdd66a958d77277c82ef1d90aa6b969c77b55ae520308		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB792 5344 bytes
font_01_sfnt_off0000c9c5.bin
ea0b65fd9c923fbe7a4cad9e0d328d43d88a08bb064fb72ad5b6b2897421acd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 10360 bytes

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