Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ec2bac80be3805…

MALICIOUS

PDF

40.2 KB Created: 2020-09-05 16:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97b729e9e14da079e8a438398acf99d8 SHA-1: bf661871b464da2fdd540d7506e9e14b0cff7b0e SHA-256: a4ec2bac80be3805064f42c03c75497dfbfafa438b25994966ab59cef9b56526
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to "borders for microsoft word 2016" and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to manipulate search engine results.

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.club/wix?keyword=borders+for+microsoft+word+2016
    • https://cdn.shopify.com/s/files/1/0437/8171/8173/files/ccna_study_guide_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6597/files/robupigemerifes.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/72360955954.pdf
    • https://cdn.shopify.com/s/files/1/0438/4368/2469/files/jevutilitofazasudi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/78589996579.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/98661576175.pdf
    • https://cdn.shopify.com/s/files/1/0430/8104/0033/files/topulexuxojekowufeluzin.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/undrip_canada.pdf
    • https://cdn.shopify.com/s/files/1/0434/4755/0119/files/ithaca_m_49.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/86693002397.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/senex.pdf
    • https://static.usrfiles.com/ugd/b7306e_99c291cbce0647d59779191132f7b9a4.pdf
    • https://static.usrfiles.com/ugd/4117a9_89147efdf5d34708a49a6e0f9c752e2a.pdf
    • https://static.usrfiles.com/ugd/b52961_a0ba7f54177145a29728df58a61ee399.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_off00005f83.bin
772638c25c1d41c2620aa8c617ce7014b16827d30f993c2ae83ba44929ed5d35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F83 5544 bytes
font_01_sfnt_off0000726f.bin
8189242f4c36993212732f8aa45c8f70ec8786e8ba58cccb67e0168bb40b8730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726F 9800 bytes

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