Malicious PDF — malware analysis report

Static analysis result for SHA-256 4805ca177541274d…

MALICIOUS

PDF

39.9 KB Created: 2020-08-10 09:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9891a4567d3e7a5ace9358ad514aa6f5 SHA-1: c8596f7c9bb78b28e1dd2115a58eaec8996ac632 SHA-256: 4805ca177541274dda1a93fe2b2eb5d62443c5f19c43dadd255ab4160bcc29c6
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a common tactic for SEO spam or phishing. The primary heuristic firing indicates a malicious redirector link, suggesting the document is designed to redirect users to malicious content. The document body, though partially corrupted, contains text related to printable dollar bills and includes the malicious redirector URL, reinforcing the lure.

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=billetes+didacticos+dolares+para+imprimir+pdf
    • http://files.stellarcarevacations.com/uploads/1/3/2/6/132695543/185c368.pdf
    • http://files.alt-terre.org/uploads/1/3/0/8/130873715/7944142.pdf
    • http://files.rubenmgarnica.com/uploads/1/3/1/6/131606803/nefajoserizag.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6672/files/lufavobuvega.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89120683065.pdf
    • https://cdn.shopify.com/s/files/1/0431/5332/6241/files/workplace_spirituality_journal.pdf
    • https://cdn.shopify.com/s/files/1/0438/4001/2450/files/sawevixir.pdf
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/2765570687.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/regezazukosuvegipozeko.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/zowimofino.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/53466146119.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/66847419207.pdf
    • https://cdn.shopify.com/s/files/1/0428/3626/3078/files/bikanedipovasilekajobemig.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/mowijewizerimo.pdf
    • https://cdn.shopify.com/s/files/1/0447/4303/2983/files/cavity_preparation_for_composite_restoration.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_off00005a37.bin
5fb7a7aaee1c7b2e948a43aeaa42cd73db061656565878a0008aa9bffc4859d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A37 5348 bytes
font_01_sfnt_off00006c52.bin
4df20c6fad82b4ea7cd0fac97975e440afcfc4bc23e391359305269aa497204c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C52 11216 bytes

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