Malicious PDF — malware analysis report

Static analysis result for SHA-256 817c4f417025d4ee…

MALICIOUS

PDF

73.1 KB Created: 2020-09-06 15:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22084af8943c74951eaa2f95fdad4d90 SHA-1: a8d404c1f62cc4102afec5ca069d1f3d537462ef SHA-256: 817c4f417025d4ee4532fad11d4c6efdfec7187409e06f9fb72e1efd487784c0
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as sheet music. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is designed to lure users to a malicious site.

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.me/wix?keyword=london+grammar+nightcall+piano+sheet+music
    • https://cdn.shopify.com/s/files/1/0431/7678/8134/files/virerumupana.pdf
    • https://cdn.shopify.com/s/files/1/0431/4749/3536/files/30155455475.pdf
    • https://cdn.shopify.com/s/files/1/0430/9182/0711/files/28171423410.pdf
    • https://cdn.shopify.com/s/files/1/0440/8524/8165/files/immunization_schedule_in_kenya_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/pdf_to_word_online_free_nitro.pdf
    • https://static.usrfiles.com/ugd/17159d_acd2cd4eaa5149c7808e21e5dd6348e6.pdf
    • https://static.usrfiles.com/ugd/a44510_4a991340a96e49c093dc9aff6bd67fe5.pdf
    • https://static.usrfiles.com/ugd/bbd3cf_a2f696ce8f7e4abf9bd24b1fdb5eaa45.pdf
    • https://static.usrfiles.com/ugd/66f7a0_a1db304e0bda411f8daf3e16ec15b54a.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7085/files/self_employment_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22511335110.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/31095278518.pdf
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/renuzoxisegirarusajudiva.pdf
    • https://cdn.shopify.com/s/files/1/0439/7514/7678/files/xamejugadoxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0315/0499/files/wivaloridizu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8445/4817/files/2038060251.pdf
    • https://cdn.shopify.com/s/files/1/0433/7424/8101/files/54427673385.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_off0000bc4e.bin
9befdd5d07e0b69dbd38f58dd6f606754e3861074d5be2b9b603473a304ac540
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4E 5428 bytes
font_01_sfnt_off0000ce9e.bin
50376f4d439fbb66fd2b082abec670bda9baf08dfad7dcbe3a8474b9e2ad5cf5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9E 16512 bytes
font_02_sfnt_off000101a3.bin
1ad30dd47fee4d3db7941b4d3dcb324bc5ea629e4afc38f8bd2427cb89640676
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 16096 bytes