Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8aba8e8edd18e4…

MALICIOUS

PDF

40.8 KB Created: 2020-10-11 08:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 26a272a0f3ac8f933fc7b315821ed940 SHA-1: e194c88fac698cb4e00931896077a0b308675ebc SHA-256: ec8aba8e8edd18e4f0fd0a8946a28d6729d5180eacb84054cf08cb8c4bdba57c
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, specifically `https://ggtraff.ru/pify?keyword=pharmaceutical+calculations+practice+problems`. The document's content is designed to appear as "Pharmaceutical calculations practice problems" to entice users to click the malicious link. The ML classifier strongly indicated maliciousness, and the presence of numerous links to disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

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://ggtraff.ru/pify?keyword=pharmaceutical+calculations+practice+problems In PDF document text
    • https://site-1038825.mozfiles.com/files/1038825/rodibisevizemodijumerew.pdfIn PDF document text
    • https://site-1048200.mozfiles.com/files/1048200/xilegoxidadawuw.pdfIn PDF document text
    • https://site-1039846.mozfiles.com/files/1039846/91806698921.pdfIn PDF document text
    • https://site-1038901.mozfiles.com/files/1038901/60592896070.pdfIn PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/zopepojuwem.pdfIn PDF document text
    • https://site-1048536.mozfiles.com/files/1048536/zozarivawufakugura.pdfIn PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/85122741913.pdfIn PDF document text
    • https://site-1036956.mozfiles.com/files/1036956/xobala.pdfIn PDF document text
    • https://site-1038492.mozfiles.com/files/1038492/mamoxalemefemilogeva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/64497c13-1c22-49dd-89cf-de79db97f474/bifaterimura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b07a2c-b69a-43de-9272-89bdfa6768a9/nilusomulilovozujodik.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_off00006043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6043 5312 bytes
SHA-256: b517172cf8a2eda364585b02567ea638b9369500d3adc415c36ee02e1fa27505
font_01_sfnt_off0000721d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x721D 10752 bytes
SHA-256: 92b380710edc7a89f8a51141fbd35bfddd170ec92615e05043d07406965cc9be

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