Malicious PDF — malware analysis report

Static analysis result for SHA-256 572562cd0744d402…

MALICIOUS

PDF

47.9 KB Created: 2020-08-06 01:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4243d7690b9dac1246b5926edd35fef SHA-1: 1410641373eeffc6491aea2c7e4f3af8c0ac428d SHA-256: 572562cd0744d402d75f518c7100a2f832dee67217c56728ca10be20d6d21db8
150 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are part of a link farm designed to appear as search results for a book. One of the primary links, 'https://ttraff.cc/pify?keyword=aluminium+alloys+book+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's structure and link farm suggest a social engineering tactic to drive traffic to malicious infrastructure.

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=aluminium+alloys+book+pdf
    • http://files.jsandlin.net/uploads/1/3/0/7/130739750/94b6b968e4.pdf
    • http://files.fryfamilyfoundation.com/uploads/1/3/2/7/132741535/dasiza_jarib.pdf
    • http://files.granthamfoundation.org/uploads/1/3/1/1/131164431/rumupirogugop_minaximudopobu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/yamaha_rx_v373_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9785/0017/files/87787662981.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/50116918698.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/tonumun.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/50103268356.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/wixusezalepesox.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/xakoxokebilinagosomexo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0712/2342/files/mepifutumoboxodezuvesa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/gujatobowiziloxobinit.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/ptcb_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/1046/3643/files/xawabutemavazobemakujafub.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/42371222468.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_off00007cfa.bin
9d17d4e5b52a96258201d5f1b0a16787dea602ab1d3e6dfe08c0690543473257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFA 5388 bytes
font_01_sfnt_off00008f47.bin
afc9a0521c38d1efd6425c4f137ebd5bea5b75b448fc6bed05999ab98aec97eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F47 10340 bytes

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