Malicious PDF — malware analysis report

Static analysis result for SHA-256 d028745c4d74c406…

MALICIOUS

PDF

64.1 KB Created: 2020-10-08 23:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 87dca7410a6b57b5686c84be41a2d400 SHA-1: 68741af5889853260aa128977469d1a8bc6cf5c5 SHA-256: d028745c4d74c4068097602f830aba54a75a8e3f7c750e83971ae618f02f5578
124 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a phishing or scam attempt disguised as an academic resource.

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 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.me/pify?keyword=ap+econ+study+guide In PDF document text
    • https://site-1040426.mozfiles.com/files/1040426/15123092079.pdfIn PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/74069210837.pdfIn PDF document text
    • https://site-1036980.mozfiles.com/files/1036980/26726589035.pdfIn PDF document text
    • https://site-1038715.mozfiles.com/files/1038715/gidajelijutebe.pdfIn PDF document text
    • https://site-1039214.mozfiles.com/files/1039214/58930806701.pdfIn PDF document text
    • https://site-1036628.mozfiles.com/files/1036628/6743836021.pdfIn PDF document text
    • https://site-1043207.mozfiles.com/files/1043207/92936022060.pdfIn PDF document text
    • https://site-1040278.mozfiles.com/files/1040278/pibuxubigujijode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9561/6407/files/tokyo_jungle_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8099/8302/files/zitesaninuvewema.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8396/7896/files/umaine_machias_academic_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6069/0589/files/cat_camera_collar_australia.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_off0000bedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDF 4996 bytes
SHA-256: c4384ae38ae4965623d2daa63f1718a44eb94af9d4cfb64011fcb5a82901bd7a
font_01_sfnt_off0000d004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD004 10656 bytes
SHA-256: 0367c530757106c251bd0136a11226d26056b86f8e2207438cdd25cf634ee484

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