Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1ac9d0d4b3c8c8…

MALICIOUS

PDF

48.8 KB Created: 2020-08-12 18:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5af414220068cac0944a4a513d2e3fb SHA-1: ab68a21934ff9d07fe1c023c7ac9a334297d7c2c SHA-256: 4c1ac9d0d4b3c8c802aaca3eec5c5d9532844decb2e4cb0d41e9ee7d77d3b944
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The primary URL points to a redirector service, which is a common technique for obscuring the final malicious destination. The document body, though heavily obfuscated, contains the same URL, suggesting it is the intended lure. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=factorising+algebraic+expressions+worksheet+pdf
    • http://files.christopherpalmer.co.uk/uploads/1/3/0/7/130740211/jegeriwetef.pdf
    • http://zewigigof.carmenschmidt.me/uploads/1/3/1/1/131164243/9247489.pdf
    • http://files.merrillicedrags.com/uploads/1/3/0/7/130775398/2167697.pdf
    • https://cdn.shopify.com/s/files/1/0432/8793/7179/files/vezunapobaperotawegege.pdf
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/lozofedugorabolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/27905574333.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/38467076742.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/92474233651.pdf
    • https://cdn.shopify.com/s/files/1/0433/1841/1417/files/fivojuwipavanedumunemixoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/42206676524.pdf
    • https://cdn.shopify.com/s/files/1/0437/8515/8813/files/lukol.pdf
    • https://cdn.shopify.com/s/files/1/0430/6852/2657/files/american_english_file_level_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/58775804844.pdf
    • https://cdn.shopify.com/s/files/1/0437/7424/7069/files/tisiforipejizonade.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_off000078ca.bin
3575cb82faddba8d61d0ec202036b9c8da7cb9f48eda3a601f867fa8c194d225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CA 5736 bytes
font_01_sfnt_off00008c5d.bin
2fae085820284d0e665f5cfcd117d47dc1ea5f35fb6e92457e04acec97f7365e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5D 13288 bytes

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