Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9db5d1eb41641b…

MALICIOUS

PDF

54.2 KB Created: 2020-08-26 14:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a34d99290f02751a872b187ad6a93d05 SHA-1: bc6efe5d35aecbbeb30d51468fb6a23a00837d88 SHA-256: 3c9db5d1eb41641b2f20d0320005b13adcdf15521b0d146c6e9084ce187cd716
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, 'https://ttraff.ru/pify?keyword=ecuacion+de+clausius+clapeyron+y+antoine', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same malicious URL and several benign-looking Shopify URLs.

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.ru/pify?keyword=ecuacion+de+clausius+clapeyron+y+antoine
    • http://files.bayareafotowagen.com/uploads/1/3/2/6/132681062/6a5088.pdf
    • http://files.davidzapparoliphotography.com/uploads/1/3/2/8/132815892/fijatuxalut-dokatad-buwode.pdf
    • https://cdn.shopify.com/s/files/1/0440/4215/8245/files/caracteristicas_del_enlace_metalico.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4157/files/pathfinder_bestiary_1_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/bash_append_to_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/lufuponit.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/tourner_dans_le_vide_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1960/files/ninimapoganigoxokebaxes.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/the_practical_kabbalah_guidebook.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3631/files/meredonekegupek.pdf
    • https://cdn.shopify.com/s/files/1/0460/0404/3935/files/vufebezedikodomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/foritig.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/riram.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/7658499721.pdf
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/effective_academic_writing_1_download.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_off00007596.bin
64f85abfa1fafe8f041353a2e987a844fa4f83bfbc55dc74251145551d28c71d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7596 5128 bytes
font_01_sfnt_off00008715.bin
309d0ef4831673431c336b5f4b500b91fb16a501314b735f1dc75e4f5a8bf319
pdf-font-stream PDF embedded font (sfnt) at offset 0x8715 15212 bytes
font_02_sfnt_off0000b671.bin
778877fd1589f7ec9a5c3e25470ee5844db96b7e1b31f69e2037e73a40aa46f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB671 16148 bytes