Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dd66fda7b4ec63…

MALICIOUS

PDF

43.3 KB Created: 2020-09-01 04:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3897cba208db6066237bb7e8c7823e00 SHA-1: 55fa09e52840d3530b79e5ba6b3243be86e8d441 SHA-256: c9dd66fda7b4ec63c023450f666c562e5132850db0f00fdfa0bd3e3c6b65db68
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: Malicious File

The PDF contains a mass of external links, including a known malicious redirector, disguised as free templates. The primary lure is the URL 'https://ttraff.link/wix?keyword=after+effects+cs6+slideshow+templates+free', which likely leads to a malicious payload. The ML classifier strongly supports the malicious verdict.

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.link/wix?keyword=after+effects+cs6+slideshow+templates+free
    • https://static.usrfiles.com/ugd/735189_f9658fbffb4546baacbb3de582b77138.pdf
    • https://static.usrfiles.com/ugd/37428b_4926b1e180124810b40fedb34cf49442.pdf
    • https://static.usrfiles.com/ugd/dba42a_0a498dd6d64449069445e261582e5e1f.pdf
    • https://static.usrfiles.com/ugd/ec0c41_384baa8aa5204d53b28e6fa6b334e345.pdf
    • https://static.usrfiles.com/ugd/83d902_eba808af22fd41b89f04dc331da5f9d0.pdf
    • https://static.usrfiles.com/ugd/bfbc46_e2e5f9f5cc074cfaa3b0f3cecd7eff34.pdf
    • https://static.usrfiles.com/ugd/73f3b0_be351659477541f0a590267072d580fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_7561fce18c124605ba7d43927f70ad2c.pdf
    • https://static.usrfiles.com/ugd/b11f6d_c442a582840d4a3185546a6e7fe8a3b7.pdf
    • https://static.usrfiles.com/ugd/f1d680_c6a6a103fe494d60abf0490d1804dc40.pdf
    • https://static.usrfiles.com/ugd/ac72e0_28492527a06b42baaeeba4f80d74a000.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a7bf8554a97403e93b7d87f1af93064.pdf
    • https://static.usrfiles.com/ugd/c8a981_507f21dd92274bcbb11d9444fe047de7.pdf
    • https://static.usrfiles.com/ugd/88a84f_9010f335f9954abeaebc56507be5542c.pdf
    • https://static.usrfiles.com/ugd/c7a620_2ab9c6dfd8cc48df87a993352aea4ff6.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_off0000698e.bin
e72985474cc3aa62243a568c30a5c54c258e57f4cc8737df7628e17bf31da097
pdf-font-stream PDF embedded font (sfnt) at offset 0x698E 5632 bytes
font_01_sfnt_off00007c9f.bin
78c4157062537fa6a92a7f0538dc1c68125d057436d741ab93512678d5b392c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9F 10368 bytes