Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e45377ee5a4bf4f…

MALICIOUS

PDF

49.2 KB Created: 2020-08-08 11:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d729329333c3a84cc04f91677ce0e4 SHA-1: e51f3c63249f602dc40dfd6a9215af4f921fe1f1 SHA-256: 2e45377ee5a4bf4f5a3f7152982c7b926cd14c84724e34cabe357fb4855bbb7d
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the string 'chopin ballade g minor pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=chopin+ballade+g+minor+pdf
    • http://files.kbzz.org/uploads/1/3/2/3/132302982/towolaki.pdf
    • http://files.nyimafoundation.org/uploads/1/3/1/3/131381712/jadenezixirifepanove.pdf
    • http://files.meaningfulmoadim.com/uploads/1/3/1/1/131164152/5157657.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/88924526421.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/livulotobalesuwevupuvem.pdf
    • https://cdn.shopify.com/s/files/1/0431/1026/9085/files/40824330805.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/nejapom.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/lic_jeevan_lakshya_833.pdf
    • https://cdn.shopify.com/s/files/1/0435/7783/5681/files/69974533299.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/35286614860.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/xegomi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0282/files/61427301780.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/the_celta_course_trainee_book_vk.pdf
    • https://cdn.shopify.com/s/files/1/0437/1329/8581/files/zejomugaruxut.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4703/files/67306319928.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_off0000840e.bin
aca37d6ea6c6301ae8ff15a64eb27c79b643612c17cff7db236790c026f7b404
pdf-font-stream PDF embedded font (sfnt) at offset 0x840E 5320 bytes
font_01_sfnt_off000095f2.bin
18b47bb2334b677ee117614947d5b5d93e228573bc764bd47e304808cf50592b
pdf-font-stream PDF embedded font (sfnt) at offset 0x95F2 10012 bytes