Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48f754b3d08886c…

MALICIOUS

PDF

43.9 KB Created: 2020-10-11 09:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3513b68794e5ca90dec0edd28b656e64 SHA-1: 28c2a985d70349f6dc1b9d606b819ea9b6d181ca SHA-256: d48f754b3d08886cf15efccddf6aed16c36111d0d8203dbabc5ee0d7cc9c8a9b
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, includes a URL that is also flagged as a malicious redirector. The ML classifier strongly supports the malicious verdict, suggesting the document is designed to lead 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://cctraff.ru/strik?keyword=operaciones+combinadas+con+parentesis In PDF document text
    • http://nawapij.linencanvaspaper.com/uploads/1/3/1/8/131856827/0d240e953.pdfIn PDF document text
    • http://fusukako.mcnamaragypsies.com/uploads/1/3/1/4/131438500/f1410b439a3.pdfIn PDF document text
    • http://files.scholacincinnati.org/uploads/1/3/2/6/132681836/wapikafijuje_powoked_vijalorozoxo_metawukub.pdfIn PDF document text
    • http://files.idcseychelles.com/uploads/1/3/0/7/130775698/mivom.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/jalezasoz.pdfIn PDF document text
    • https://site-1040528.mozfiles.com/files/1040528/kamivadifomuvoluwiwitum.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/57739268186.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3895/2610/files/flying_in_pandaria_at_85.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4146/3204/files/quiz_bowl_questions_college.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0810/8955/files/danididobilibarewon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F76 5144 bytes
SHA-256: 2f4b4f94344da93740647784ed2e9318aef7ad648b32b570a83e5933de4cba6d
font_01_sfnt_off000070c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C1 10660 bytes
SHA-256: 5994a905ca5ea13b2050cad29539c478bde97aa006496b2d41593aed24e70149
font_02_sfnt_off0000933f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x933F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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