Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b0b3522b4e2be3…

MALICIOUS

PDF

44.8 KB Created: 2020-09-19 15:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c02c91d6ac78bd10791cccbbc8e1ba9 SHA-1: 6f2e405c4967b94e00a9dc6734ac488258eabc1d SHA-256: 73b0b3522b4e2be3d9a08fabc88e870e848ff653f058a14a44e984d6ee6f0255
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also functions as a link farm, directing users to multiple external PDF documents hosted on disposable domains. The embedded URLs suggest an attempt to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.club/wix?keyword=mors+certa+hora+incerta+tattoo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://56ed0aea-94af-4fb5-b328-00bd3d422230.filesusr.com/ugd/913720_fa705bc4b157448f9df487add0612de5.pdf?index=true
    • https://c122369f-ca16-4a77-b258-017edebe6a1c.filesusr.com/ugd/69695d_3e3f144fc5804104b3c5c6f362ccba89.pdf?index=true
    • https://40e08ea6-1fe8-4f84-8ead-1c99965d3b29.filesusr.com/ugd/e4ff69_ea28434471384a26900bd661c346461b.pdf?index=true
    • https://daafe15a-6ff1-478d-8aae-3017d8c86e88.filesusr.com/ugd/e50c99_af90e9a36d8e4126ac5044102303ab36.pdf?index=true
    • https://399c28bc-d41e-490e-ace9-396f0602f7fe.filesusr.com/ugd/11b39a_fb8a3a1117fa4eb1a77099c018bbaa49.pdf?index=true
    • https://01949f4a-bdbb-4855-918e-c53622ce708e.filesusr.com/ugd/0d018b_04d26d23533b4c6db43621ef781660fd.pdf?index=true
    • https://a72f5e72-3660-4820-8130-939f594a4513.filesusr.com/ugd/c618e9_d3db6156de664ffba4d403e111cb0486.pdf?index=true
    • https://3d4d3686-73cc-42a9-8808-861752251e31.filesusr.com/ugd/c67d0c_a476f48a0f94453bad9f28155a40cea2.pdf?index=true
    • https://6df546ad-a02b-4557-b08c-dc45ca329e03.filesusr.com/ugd/724fb5_79912794c687429589eb6332dd3ed55b.pdf?index=true
    • https://662e8fe6-4064-48b5-8bb7-46b1054fd1c3.filesusr.com/ugd/60e703_fc8ccb1cc528460880396e6be203a3d8.pdf?index=true
    • 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_off00006d61.bin
6630442c123ed8b51009659b2993cf53f383124cc61aaa999689228a29ff1802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D61 4860 bytes
font_01_sfnt_off00007de8.bin
582c01895428ddca1c59cb8b5547dc01d5f54b15b55818b5154a164c14fdcf99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE8 13288 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.