Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ffc73e2c40d6af…

MALICIOUS

PDF

43.3 KB Created: 2020-09-12 16:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 007dc91463670c71c45e14c7fc1c7f67 SHA-1: 9915cc0a4881e5531c92a0a4702f2664aec6e219 SHA-256: 35ffc73e2c40d6af852f9e052403f2fe7d561301a43e3df576d942f6083c4dbb
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=general+knowledge+quiz+2019+questions+and+answers'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify and other domains. This suggests a link farm or redirection strategy to obscure the ultimate malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=general+knowledge+quiz+2019+questions+and+answers
    • http://nuduj.designmindcreates.com/uploads/1/3/1/4/131483068/7623282.pdf
    • http://jopil.feedthebabes.com/uploads/1/3/2/7/132712461/resasolala-liripivap.pdf
    • http://detegelal.tcusanationals.com/uploads/1/3/1/8/131857544/6581219.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/driver_2_psx.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/bixby_apk_for_s7.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/fipirukak.pdf
    • https://cdn.shopify.com/s/files/1/0432/4917/2643/files/capital_letter_m_tracing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/wabomasodikep.pdf
    • https://static.usrfiles.com/ugd/2994dd_6e75f089dcec45c6a04af189d6882d9c.pdf
    • https://static.usrfiles.com/ugd/1cc777_ee0e72025a2a4e7aa5a0e0a5af4e24ab.pdf
    • https://static.usrfiles.com/ugd/c068f8_3afaf2bbd58541d492fdc8ded49db6b5.pdf
    • https://static.usrfiles.com/ugd/a72fa8_15fe48070566468389fc159e3982cdd3.pdf
    • https://static.usrfiles.com/ugd/ee6100_71a0a1309580401d897ec9cb7e966bbb.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_off00006983.bin
974469e9b9d4a75f843cfbec5699336263d4132568e809ede34a83e43751d250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6983 5840 bytes
font_01_sfnt_off00007d86.bin
5afebde1f1896a70c8eec19fe25031be2df22ec5921d01e4b4e55d05611db53f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D86 10252 bytes

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