Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b11a10f77088be…

MALICIOUS

PDF

42.6 KB Created: 2020-10-07 04:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e134a852d16d3537c870789f78beac84 SHA-1: dc287b02c5177a931291e3aec77de5083e3f777f SHA-256: 18b11a10f77088be19f84e6070e897bf2eb8af3ce5a4656e6c04da93c312f0f1
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ggtraff.ru/pify?keyword=red+azalea+free+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The ML classifier strongly indicates maliciousness, and the presence of multiple disposable hosting links further supports a malicious intent to redirect users to harmful content.

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=red+azalea+free+pdf In PDF document text
    • https://site-1036946.mozfiles.com/files/1036946/30962688219.pdfIn PDF document text
    • https://site-1037048.mozfiles.com/files/1037048/13323999446.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/25241687230.pdfIn PDF document text
    • https://site-1038974.mozfiles.com/files/1038974/64960099368.pdfIn PDF document text
    • https://site-1038915.mozfiles.com/files/1038915/20894097856.pdfIn PDF document text
    • https://site-1036746.mozfiles.com/files/1036746/59079174978.pdfIn PDF document text
    • http://files.clovisparkinthepark.com/uploads/1/3/1/3/131380730/4065802.pdfIn PDF document text
    • http://files.humblebeewellness.com/uploads/1/3/1/4/131437438/6584f1b196211.pdfIn PDF document text
    • http://dedoxe.whitneysoup.com/uploads/1/3/1/4/131437906/kijofev.pdfIn PDF document text
    • http://files.musefuse.org/uploads/1/3/1/4/131483128/5373928.pdfIn PDF document text
    • http://files.dfwcinderella.com/uploads/1/3/0/8/130874250/8690755.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A62 4912 bytes
SHA-256: 3afd36361195b8b2c776d07db7c4a266c6d01fe25e55afec8043872d186a9795
font_01_sfnt_off00007b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3C 10096 bytes
SHA-256: 267590559b5e0645dc31644223e4756414bd5b4ebf1a0a5cc9bd159a7bae6b1c

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