Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef8ae346cd19f2e…

MALICIOUS

PDF

77.4 KB Created: 2020-08-06 20:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b874cd0a6bb067dc94c18f6a6d7404e1 SHA-1: d08e804b7584cd6ba67631cb01e15b93b11bd539 SHA-256: 4ef8ae346cd19f2ecfa54e0eb7069f1d42dff825400c9f86f38e720d050526b2
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=social+network+vocabulary+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0437/9020/5090/files/avi_to_mp4.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL, suggesting a lure to a malicious site.

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.cc/pify?keyword=social+network+vocabulary+pdf
    • http://files.adparametrik.com/uploads/1/3/0/7/130739081/5054099.pdf
    • http://files.leonbergersofnorlil.net/uploads/1/3/0/7/130740553/9602180.pdf
    • http://files.neciasnotables.com/uploads/1/3/1/4/131453540/nakuna_mevevuvevuxidu_tazupewofo_lunirosejugix.pdf
    • http://files.convictroad.com/uploads/1/3/0/8/130813366/909a6020cfc0.pdf
    • http://vofurot.johannaharman.com/uploads/1/3/2/7/132712615/xozenem.pdf
    • https://cdn.shopify.com/s/files/1/0437/9020/5090/files/avi_to_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/afrofuturism_womack.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/30549361154.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/junigegipa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/16379038118.pdf
    • https://cdn.shopify.com/s/files/1/0448/1161/6418/files/automation_direct_gs2.pdf
    • https://cdn.shopify.com/s/files/1/0430/7209/4362/files/mabixeluxozusofiba.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/62106603565.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/39301416066.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/46840234396.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/oracle_virtualbox_on_pixelbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/96942034135.pdf
    • https://cdn.shopify.com/s/files/1/0429/2883/2675/files/bumunotamivovajizovokut.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_off0000f0de.bin
ce5f008c267d009ec841a9f3e9cb199b79642f56cc130820c365048292206060
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 5532 bytes
font_01_sfnt_off000103dc.bin
297ab9c603b26bef7a51d01bf7f894d3480b67b3cd76a4e757213675a71d34ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10740 bytes