Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b021380f51d38b9…

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 16:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 358db402bdfadc3483acee38cebaee48 SHA-1: 0eae3efc7b6f0624428207183526d0e4ca9dc5e5 SHA-256: 0b021380f51d38b9a269d9fca3f8abcb223e685a2936bb8965d11eba49a54c10
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, embedding numerous external links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to lead users to harmful content or phishing sites. The document body contains garbled text and URLs, further supporting a malicious intent.

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=astro+awani+news+reporter
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/sapuvexusebilixozituf.pdf
    • https://cdn.shopify.com/s/files/1/0436/5385/7433/files/39210318611.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/vobezolo.pdf
    • https://static.usrfiles.com/ugd/eed56f_7f38dd7258884d2b88ae1786b1fba821.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_d57ef458791b45d6989946f942331967.pdf
    • https://static.usrfiles.com/ugd/c83fdb_f3d1de285ed94f778d9e78edaf45f7cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_db3c08653dbf460793325522e1576ce8.pdf
    • https://static.usrfiles.com/ugd/accd1f_e219df16712242faab919aa9e884ed76.pdf
    • https://static.usrfiles.com/ugd/b8c837_bde66f290384459f8005a915f23b92a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_63f930eeefe54607b2a09fbba739838f.pdf
    • https://static.usrfiles.com/ugd/c068f8_3df8bbb95f454bdc9be6416a38019b3a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69143450337.pdf
    • https://cdn.shopify.com/s/files/1/0432/8128/5286/files/hernia_femoral_tecnica_quirurgica.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e2e.bin
9f3a9ec886f8c9405d763c19bef8f6c8a834e539065c15bca45f1615fec46928
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2E 4860 bytes
font_01_sfnt_off00006ed7.bin
41227d873a63b12f46d0e3e129677d3da17c00c27f9390f98b482303ae67600a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED7 9852 bytes