Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acbde159242dcc4…

MALICIOUS

PDF

35.9 KB Created: 2020-08-09 21:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf6221adccdae4a508bea7c74638f0a9 SHA-1: 56ec3ea470acf740dfe80c9eea9d66ce6c798f1a SHA-256: 3acbde159242dcc4d844ace9c80f16aedf10cd4ae427683a9771a07231e3221a
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a "renal pathology mcq pdf". The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the primary link leads to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic suggests a large number of embedded links, many pointing to Shopify domains, likely to obscure the malicious destination. The ML classifier also 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.cc/pify?keyword=renal+pathology+mcq+pdf
    • http://files.birdsongholistic.com/uploads/1/3/1/4/131453536/9188689.pdf
    • http://files.stratforddogagility.com/uploads/1/3/1/8/131871587/digexil.pdf
    • http://files.themonkeysbanana.com/uploads/1/3/2/6/132695620/9899874.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/91231678375.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/48893036988.pdf
    • https://cdn.shopify.com/s/files/1/0429/9315/6259/files/dijov.pdf
    • https://cdn.shopify.com/s/files/1/0438/9155/6504/files/tuwuzulanemowe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/47732618047.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/48461658765.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2153/files/12th_botany_practical.pdf
    • https://cdn.shopify.com/s/files/1/0432/5054/8899/files/sugamivew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5487/files/22875169633.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5634/files/wewurenedijuxumukariluf.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_off00004eeb.bin
303090c15805248a41506b74427201865c61b647493c3ec3d7b308605dee0519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EEB 5528 bytes
font_01_sfnt_off000061a4.bin
ad92db3e368dddeaa7ff90567cf87c67fc3255336f0b6eaa8666e412fb9ae8fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A4 9948 bytes

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