Malicious PDF — malware analysis report

Static analysis result for SHA-256 a127065e09e74db6…

MALICIOUS

PDF

40.6 KB Created: 2020-08-11 21:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0d4848500a5e842b06d101a78b4d189 SHA-1: fcfc11ef902be02d9381e41a0c41230b8f052cab SHA-256: a127065e09e74db643016056e18e42b2bb5d35e3d78cef1223f241ae8f796634
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, masquerading as a document about workplace bullying. This indicates a phishing or social engineering attempt to direct users to harmful content. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve search engine ranking for malicious content. 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=workplace+bullying+in+nursing+pdf
    • http://files.westmountwildrugby.com/uploads/1/3/0/7/130740596/wemuvevoxijit.pdf
    • http://files.janinegoldsworthy.com/uploads/1/3/0/7/130776218/mepinasegev.pdf
    • http://files.linwoodfarmersmarket.com/uploads/1/3/1/4/131406662/visepumafona.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/10478206.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4191/files/50866748307.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/basozowolunimubezuwabowab.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/99559168748.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/nemogusukaji.pdf
    • https://cdn.shopify.com/s/files/1/0429/9984/0921/files/87845673434.pdf
    • https://cdn.shopify.com/s/files/1/0438/0642/5248/files/87518093749.pdf
    • https://cdn.shopify.com/s/files/1/0436/9242/5384/files/39034705666.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/jajisagimuwilakitadoruzim.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3264/files/zujuraguduvupibotaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6327/9767/files/10986947606.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/lebomegatitibotuxorupi.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_off00005f38.bin
7884e25e11aff306c28634dc82a1c45b06718dc37cc5e34f793634b71fdf4d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F38 5644 bytes
font_01_sfnt_off00007293.bin
41125fa5c87325436d004907ef9fefe1d8501e57390ad80c1bd9f6173c992914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7293 10328 bytes

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