Malicious PDF — malware analysis report

Static analysis result for SHA-256 e901de7ea4e58041…

MALICIOUS

PDF

71.7 KB Created: 2020-08-11 22:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a125d6b08aa507da17fc4819494d5aa SHA-1: 1943ff812d61771494591b62d5307d676e24f2dc SHA-256: e901de7ea4e58041674dc67c8c9a69c482be5700f314c4dcfead75baf0187910
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be a phishing lure directing users 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.com/pify?keyword=estilos+de+aprendizaje+segun+autores+pdf
    • http://files.backyardhackers.com/uploads/1/3/0/7/130740625/jititafun.pdf
    • http://files.zoevanmourik.com/uploads/1/3/1/1/131164431/gesidewirugelux-gikolo-wufiguji-xosuv.pdf
    • http://files.amsalemlab.com/uploads/1/3/2/6/132696117/54f47203fdba592.pdf
    • http://files.studycaribbean.com/uploads/1/3/1/3/131398117/firitadufogexag.pdf
    • https://cdn.shopify.com/s/files/1/0437/1726/3510/files/characteristics_of_management_accounting_information.pdf
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/28390511351.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3881/files/61711481054.pdf
    • https://cdn.shopify.com/s/files/1/0428/6844/1254/files/73264599746.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/tudifadajobozutuzalaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/8034/1917/files/pogitemixubedido.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/nevifujeworalomekunimo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0405/8010/files/cassandra_clare_red_scrolls_of_magic.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31931154882.pdf
    • https://cdn.shopify.com/s/files/1/0452/6263/5168/files/centrales_trmicas_de_ciclo_combinado_teora_y_proyecto.pdf
    • https://cdn.shopify.com/s/files/1/0435/7737/6936/files/simple_present_tense_adverbs_of_frequency_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/87032574066.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0008/files/goldman_sachs_blockchain_2020.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_off0000d800.bin
87272954e1868f0e5f008787a687ed88da59c43e287dbeff21e01d8033ee435d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 5292 bytes
font_01_sfnt_off0000ea25.bin
7d10c7ab3e40a36b34b2c61781e20484c1f717be5b25489f399d23bce80323a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 11544 bytes