Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fc199e66f3758e…

MALICIOUS

PDF

42.7 KB Created: 2020-08-19 19:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9c64634e2cfdd31fd8bd36384ce935 SHA-1: 72bba8fe84218a912527c98a199863571f59f5f9 SHA-256: d9fc199e66f3758e84efc5766127a88f6d5f3264206897fe01e7c9b0610743c7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a specific malicious redirector URL, disguised as a legitimate document. The primary malicious link is https://ttraff.ru/pify?keyword=office+ergonomics+risk+assessment+template, which is designed to lead users to further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=office+ergonomics+risk+assessment+template
    • http://files.serenityreikiclinic.com/uploads/1/3/0/7/130775712/netigodesene.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/background_check_authorization_form.pdf
    • https://cdn.shopify.com/s/files/1/0443/0639/9388/files/ict_business_case_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/silaz.pdf
    • https://cdn.shopify.com/s/files/1/0464/1226/7688/files/27452940131.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3990/files/pro_tec_snow_pusher.pdf
    • https://cdn.shopify.com/s/files/1/0435/8632/2600/files/swot_analysis_example_of_human_resource_department.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/63716303735.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/68926306032.pdf
    • https://cdn.shopify.com/s/files/1/0434/0419/8044/files/kowebogazezirodeju.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/chair_exercises_for_seniors.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2552/files/spelling_bee_words_for_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40323832667.pdf
    • https://cdn.shopify.com/s/files/1/0434/1311/0951/files/charities_sorp_template_accounts.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_off000069ab.bin
e23a695a0595db841cfd558085e5f4b6bb39accf1e3648afb303f50012b74a7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x69AB 5428 bytes
font_01_sfnt_off00007c0e.bin
5465f7d5fdaf8e262bf82257eb026d5e189cb5064dcefad74670cb1d0603eac3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0E 10096 bytes