Malicious PDF — malware analysis report

Static analysis result for SHA-256 15abcf4824ad3933…

MALICIOUS

PDF

67.5 KB Created: 2020-07-29 16:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac6b77da9183f4a035166cf749f61390 SHA-1: 2859b5e31a016e760a0226e209756585bfca435f SHA-256: 15abcf4824ad39333a68be9ad58c0df78c2aef2b3f054644f38d8886db87bde1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links, many of which point to a redirector service known to host malicious content. The primary malicious URL identified is https://ttraff.ru/pify?keyword=overhead+absorption+costing+pdf, which is likely used to funnel victims to further malicious sites. The document body, though heavily obfuscated, suggests a lure related to costing PDFs, aligning with the heuristic findings of a malicious redirector and link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=overhead+absorption+costing+pdf
    • http://files.sustainablewellesley.com/uploads/1/3/2/8/132815924/7079773.pdf
    • http://files.nypa.com.au/uploads/1/3/1/6/131636655/6a2b92a2.pdf
    • http://files.stand2serve.org/uploads/1/3/1/4/131483138/7382014.pdf
    • http://files.maduar.com/uploads/1/3/1/0/131070207/visabutepurud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8940/3810/files/79759349499.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/famejolenogosagefurig.pdf
    • https://cdn.shopify.com/s/files/1/0430/1779/7785/files/76406749271.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/71395141566.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0920/files/60132428344.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/wunol.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/68223371343.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/85580311557.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/32855465131.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/binitenemomavogugedude.pdf
    • https://cdn.shopify.com/s/files/1/0436/2082/7300/files/visemabefidisujuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3282/files/95200019690.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66048758492.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae3.bin
8acb03602c39972732c70f6fdae2db0a9c6f7310726f82b9a95b46e63cf67ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE3 5400 bytes
font_01_sfnt_off0000dd3c.bin
c2589aa5d3fda0ca7385730062f2d3b9dfc12fb25a56e90527a82a2f0e1e7878		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 10500 bytes

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