Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d5a90a87ec8223…

MALICIOUS

PDF

52.6 KB Created: 2020-08-31 12:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b658d2bc525dfc8744e1de8908e6e1ed SHA-1: c290a59aef475ba964ff9e6ca1d7148cf635949b SHA-256: e6d5a90a87ec822321ffddd143b8e9357a9599bf15eaf968910dc86e2c26b64f
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and other Shopify-hosted PDF links, suggesting a lure to a malicious site under the guise of academic material. The ML classifier strongly supports the malicious verdict.

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=catalizadores+en+quimica+organica
    • https://cdn.shopify.com/s/files/1/0433/5622/5686/files/mezigexidolopigosatek.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1059/files/bijamobubejurodiligadu.pdf
    • https://cdn.shopify.com/s/files/1/0462/6762/9730/files/drdo_ceptam_9_answer_key_jobriya.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e6aea36c5cd4d009ef0b9ffa9e8055f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f63fa5da256941cfae0d6e715e33bf67.pdf
    • https://static.usrfiles.com/ugd/36f25b_23aee7b9f08b44098b6ce51ee0032e9c.pdf
    • https://cdn.shopify.com/s/files/1/0450/1107/5222/files/feedback_amplifiers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bofudajix.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/vuvupuzupufedejuselu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0565/4678/files/zirakuzad.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_off00008fdf.bin
1c927bd9d069388540c7f7f38e3870c2a80771f94c1710ab6cd5e1cb77b03680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDF 5340 bytes
font_01_sfnt_off0000a1ed.bin
f613c5ed37dc4e72c6af6cf82442c3c31aacebab758108078d44fadc9ac04574		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1ED 10492 bytes

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