Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd42662da1b02e92…

MALICIOUS

PDF

54.5 KB Created: 2020-08-08 03:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d638256b7d696764e255f46658d44e8 SHA-1: 3bab88a800974584cdd2cdd9dc3859278d3e06c6 SHA-256: cd42662da1b02e92ca0d55bb2dfe4a73113619c0efc0f4d68013d02faaa3cc05
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning scheme designed to lure users to malicious sites. 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.cc/pify?keyword=speaking+business+english+like+an+american+pdf
    • http://files.ferrumforge.com/uploads/1/3/0/7/130776558/susutejatiga-dokutave-jabomajabun.pdf
    • http://files.harvieherrington.com/uploads/1/3/1/4/131482878/5cc895e.pdf
    • http://files.benjaminjephta.com/uploads/1/3/1/3/131379099/lugebapos.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/vutiwovodinoleve.pdf
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/vilivogofogi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/beselutuginafoma.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/rolezuwirepozapugoza.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/bipavositas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/37644174648.pdf
    • https://cdn.shopify.com/s/files/1/0432/3767/1080/files/mulive.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1275/files/twic_card_application_forms.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_off000095c5.bin
eef8b777a8e0e76cee64dd7edf5789501a5f88e70157ce93158a048e98cfddc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95C5 5876 bytes
font_01_sfnt_off0000a997.bin
94eafeb2d7f3dc72d22fbeee75a5e50b610cda1dc69eea2919c4521ec4aef6ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA997 10388 bytes

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