Malicious PDF — malware analysis report

Static analysis result for SHA-256 943c5152058e28d0…

MALICIOUS

PDF

43.1 KB Created: 2020-08-30 10:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 109abfb9bcbae9bde4fc954c585d8a61 SHA-1: e790b9dabc850b3a5fb8697dbc25fd11c237a928 SHA-256: 943c5152058e28d0df4bcd5bafc1567ea80581c840e5007fd967b9a447db19b1
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous external links. One prominent link, 'https://ttraff.ru/wix?keyword=boye+round+loom+patterns', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and several benign-looking Shopify URLs, suggesting a potential lure or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=boye+round+loom+patterns
    • https://cdn.shopify.com/s/files/1/0439/5322/5883/files/admin_template_bootstrap_4_rtl.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4422/files/732384224.pdf
    • https://cdn.shopify.com/s/files/1/0450/7333/4424/files/un_mundo_feliz_aldous_huxley.pdf
    • https://cdn.shopify.com/s/files/1/0459/1678/2741/files/oppo_f1s_android_version_upgrade.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/arduino_uno_programming_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/7515169454.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/jotowofanigigijava.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/je_vous_informe_traduction_en_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/takitirovotagunasa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8194/files/punjab_textbook_physics_9th_class.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tovunegorudakumuwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7724/files/tusop.pdf
    • https://cdn.shopify.com/s/files/1/0437/7244/4823/files/jorobofi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/agglutination_test.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_off00006050.bin
e956a11d3e02d648dfc321369b22fcce54c4edd06f44787ede4c740252818f04
pdf-font-stream PDF embedded font (sfnt) at offset 0x6050 5256 bytes
font_01_sfnt_off00007218.bin
712438d6c8cc49c9c25aa73c832601494950305e4656d80175007b4532bb2f9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7218 14816 bytes