Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3edef05d1e1507e…

MALICIOUS

PDF

48.0 KB Created: 2020-08-03 17:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adb13bbcd5a56823345c59b1162f15b4 SHA-1: 68a744cc6a917a9e93e4800354e86720fe24dd6c SHA-256: f3edef05d1e1507e330351a02065b04e00e26b0d63423b763be30ea5fc8d0849
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm. One of these links, 'https://ttraff.com/pify?keyword=antigona+sofokles+pdf', is identified as a malicious redirector. The ML classifier strongly supports the malicious nature of this document. No scripts were extracted, and the document body is heavily obfuscated.

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=antigona+sofokles+pdf
    • http://files.healthyenvironmenthealthychildren.com/uploads/1/3/0/8/130873983/godiwofojol.pdf
    • http://files.glendyyeung.com/uploads/1/3/1/8/131857305/902577.pdf
    • http://files.watchedproductions.com/uploads/1/3/0/8/130874489/giligewezupale-bowazamas.pdf
    • http://files.thehitsvillesoulsisters.com/uploads/1/3/1/3/131379678/77300.pdf
    • http://files.withvsat.com/uploads/1/3/1/8/131857315/vipedonijex_joruwarunep.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/67711673194.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/39391789225.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zixetirubopejama.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89853177043.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2338/files/poxunaluluxigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7134/0698/files/wedadub.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2548/files/4882066941.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/5923823404.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4316/files/nemowavamati.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/dosujitirekituputix.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/tipasuginopapen.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_off00006f55.bin
5ce58611fb5ab91e87e97d38c26793663dd4139d319e0b65b7feea7da5fb80df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F55 5168 bytes
font_01_sfnt_off0000810c.bin
b7f1e4034150d7d149ff187432316a804e550eced99c4189b18143ec45ce60c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x810C 16108 bytes

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