Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32a2bb0463a61a8…

MALICIOUS

PDF

46.3 KB Created: 2020-09-05 11:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 43cac3130a42c4cf0a767216800d8bd3 SHA-1: 9aa0e91717c252c42ba47d87d47a0c5a3ef2735a SHA-256: d32a2bb0463a61a8d6e281e5a2540d46eb39800f0862a15f4ef373f5dfebf8ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link to a known malicious redirector, ttraff.com, which is disguised as 'epidemiology interview questions and answers'. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or social engineering attack. The document also contains a large number of links to external PDFs, indicating a potential link farm or attempt to obscure the malicious redirector.

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/wix?keyword=epidemiology+interview+questions+and+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/529385_4c87ac7897c24ce3bba2dee9d7a031b5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_3fbf20b3a4684a5ba762c53a39b1ad9c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4826f5_067ea122bf9f4a52b759c441ac13ced5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/81d6a4_0a2f9af74a4542329897325da384bb25.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d6af85_4f0bb2bb5dea4887855c4073afc06a6c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4819/8556/files/sheng_siong_group_annual_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8590/3510/files/business_process_mapping_template_visio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/96395683253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/lumepovuvoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2548/9305/files/tactics_for_listening_tapescript.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_f488848918cd444ea40602ca62bbc208.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/10b11f_b1ad0169c77945e7b825d2367b85ced8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9904c2_dcd910575b45430ea44492aefc72d9a8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_beb9bb55217544229a6b1741dcba9f81.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/828753_aa6010d17016485c805ef86975bb2c18.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7664 5616 bytes
SHA-256: ae592ca5797086e7e6c53763fbf3c07707cd34dfc675722fba3049074056dd65
font_01_sfnt_off0000897f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x897F 10120 bytes
SHA-256: bca851f06ddbd2a6fabd6c124b462ab90296fe7976f0445a45a8519285136b26

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