Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77aa45faeed8e0a…

MALICIOUS

PDF

49.8 KB Created: 2020-08-29 20:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 061d21e980a4cdcb7e4f834faf3846f9 SHA-1: a34246bff76b41855b49bc2d827d8be40820f5ae SHA-256: f77aa45faeed8e0a6cb2568f1e62841e00b9423bdc49b61f16719148922e8af0
150 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains numerous embedded links. One of these links, https://ttraff.com/wix?keyword=arista+normal+western+font+free, points to a known malicious redirector. The document also features a link farm of 24 PDF files hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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.com/wix?keyword=arista+normal+western+font+free
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/67199872089.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/rakudipezom.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/mosoterim.pdf
    • https://cdn.shopify.com/s/files/1/0436/0713/0270/files/chester_county_property_records.pdf
    • https://cdn.shopify.com/s/files/1/0434/6875/0998/files/28119997700.pdf
    • https://cdn.shopify.com/s/files/1/0457/6683/6388/files/dubikir.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/wepuxegiso.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0826/files/wodesiwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7576/files/357867257.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/internship_report_sample_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0459/1249/0133/files/vimigoviwelasumoruxanil.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/43205966241.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_off000080a7.bin
dc89d34c8269769282d71eff3b84fa3ae6669c4a26ecdc4f7bfcea314f55608f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A7 4992 bytes
font_01_sfnt_off00009194.bin
769723acd21f7a6a569f7e03792c9dab602c04988247a87c9676cf4be2003c53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9194 12132 bytes

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