Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fed9af4d222ca4…

MALICIOUS

PDF

44.3 KB Created: 2020-09-10 04:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ffb3fe111e452b383e6b348fd51675f SHA-1: 0610b493e6fdee07ca1498e9076d3eccc295214f SHA-256: 52fed9af4d222ca4db9a1c680503501cb1ec1cfd0b6abd4ca0e6f15affcae548
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a link farm. One of these links, 'https://ttraff.link/pify?keyword=flossbach+von+storch+multiple+opportunities+factsheet', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document.

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.link/pify?keyword=flossbach+von+storch+multiple+opportunities+factsheet
    • http://lunup.signguides.org/uploads/1/3/2/6/132695663/boriwadowuzameg.pdf
    • http://jejoniw.jessicadixonmajka.com/uploads/1/3/1/6/131606347/8146720.pdf
    • http://files.hilaryhachey.com/uploads/1/3/0/9/130969842/fugobix_bitanuvomoz_wususiro.pdf
    • http://files.santarigreen.com/uploads/1/3/1/3/131381369/kevalos_rudefulawow_sunavatever.pdf
    • https://static.usrfiles.com/ugd/185c00_39e6c0c50a7f45c79a60df1723868ee2.pdf
    • https://static.usrfiles.com/ugd/b50c55_247d6b14baa24a03b4b16a886a7c4be9.pdf
    • https://static.usrfiles.com/ugd/37321e_f77509c6b63d4eb5a9c86222b7b1e5ed.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/92661403238.pdf
    • https://cdn.shopify.com/s/files/1/0463/5272/8230/files/esophageal_varices_surveillance_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/6671/9385/files/lawn_service_flyer_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/pegufoxamufawiku.pdf
    • https://static.usrfiles.com/ugd/defcb2_5e6485c18d1a47a39afc923d7bc69c9f.pdf
    • https://static.usrfiles.com/ugd/c6ac46_110c0f26be9242f38c4470b0da0e2e47.pdf
    • https://static.usrfiles.com/ugd/77941b_6b3019fb93c345f1997a87a49fd7426d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006213.bin
cbbe5169f2fb59ac8e885751007942a28958806c67d527e08fbcc2803f6b68bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6213 5292 bytes
font_01_sfnt_off000073e7.bin
5d018bbdf198bb7f984e9da7860fab721c39e8722ace10a4d7299716f6a24ca5
pdf-font-stream PDF embedded font (sfnt) at offset 0x73E7 9956 bytes
font_02_sfnt_off0000960d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x960D 4324 bytes