Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f282633f70e3efb…

MALICIOUS

PDF

88.8 KB Created: 2020-10-03 07:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 64641b820b0763129209ed2e0e542ec1 SHA-1: 7979686650a9508ea531d18d822f4b26f820750e SHA-256: 7f282633f70e3efbc8a57e49172eac3a0cb8a41bee3483198fbf5a684bf8a7dc
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document functions as a link farm, containing numerous links to external PDF files hosted on various domains. One of the embedded links, 'https://cctraff.ru/strik?keyword=vat+registered+explained', is identified as a known malicious redirector. The document's content and structure suggest a phishing or scam attempt, likely aiming to redirect users to malicious websites or download further malware. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=vat+registered+explained In PDF document text
    • http://files.laurencuddy.com/uploads/1/3/1/3/131384145/fb6c0357c5d22d.pdfIn PDF document text
    • http://polere.onewayjesusministries.org/uploads/1/3/1/6/131636755/bowon.pdfIn PDF document text
    • http://files.sybilsyarnshop.com/uploads/1/3/1/6/131606617/pepiba.pdfIn PDF document text
    • http://files.bullengarookadultriders.com/uploads/1/3/2/6/132681596/fomapofegaro-wopigadazodup-zevevamer-tirexilagenizo.pdfIn PDF document text
    • https://site-1040006.mozfiles.com/files/1040006/tefawupogamuxuwit.pdfIn PDF document text
    • https://site-1036921.mozfiles.com/files/1036921/48667971412.pdfIn PDF document text
    • https://site-1037215.mozfiles.com/files/1037215/dazodipisitivufego.pdfIn PDF document text
    • https://site-1037129.mozfiles.com/files/1037129/gikuzitonomovoxiru.pdfIn PDF document text
    • https://site-1036711.mozfiles.com/files/1036711/10532374045.pdfIn PDF document text
    • https://site-1037033.mozfiles.com/files/1037033/65778605667.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://uploads.strikinglycdn.com/files/0441fb42-47b0-41ed-b69f-16bc91924ca0/183157413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2dce8c4-ec53-49a8-87e0-228126a4ede9/niparamekugupal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4385ad17-b414-49f8-aa0b-d813a0bef2dc/27243536498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f47f63b8-b3a8-4a57-988e-f6d2b7c6f0f2/xisupogabadegoxotuxawexiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39874363-a967-434d-9222-2ae7a3b513f2/44408503922.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_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 4836 bytes
SHA-256: 8f1f9e5a845c5c1c307e33cf835bd80ee76d96f1d6a5b85c7f01d0c967405cb4
font_01_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 10444 bytes
SHA-256: 1ba99b37511b13f78c4d254bd45b7f0e7b4f3247ad086d1e588d2b708ebde6f0
font_02_sfnt_off000147fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FB 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71