Malicious PDF — malware analysis report

Static analysis result for SHA-256 3908a0f1ce643089…

MALICIOUS

PDF

43.0 KB Created: 2020-10-05 20:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 655924081c0779b7f761121519884299 SHA-1: f9633c46414c7d98ad38e3ba3ca40d436d4acffb SHA-256: 3908a0f1ce6430896816c3abb82092818bb0f5335de759ae55af1ac636d2137c
184 Risk Score

Malware Insights

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

This PDF document acts as a link farm, directing users to multiple external websites, one of which is identified as a malicious redirector. The document's content is obfuscated but appears to be a lure related to 'best pdf app for ipad pro'. The presence of numerous links suggests an attempt to distribute traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/strik?keyword=best+pdf+app+for+ipad+pro In PDF document text
    • http://files.lyssanda-designs.com/uploads/1/3/2/8/132816107/kumeredupewilidena.pdfIn PDF document text
    • http://files.krmcloughlin.com/uploads/1/3/0/8/130814208/4774096.pdfIn PDF document text
    • http://gexul.newtampapainters.com/uploads/1/3/1/6/131636825/8698542.pdfIn PDF document text
    • http://files.artistmarnie.com/uploads/1/3/1/4/131454143/zopakuk.pdfIn PDF document text
    • http://files.coloradobankruptcyfirm.com/uploads/1/3/1/3/131378930/kudetolomalokatemef.pdfIn PDF document text
    • https://site-1037274.mozfiles.com/files/1037274/85527679363.pdfIn PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/83727535840.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/a525401a-4ad7-49fd-a03f-3579e69f45db/figakafavizezozatotupawip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a951be2-f050-4e55-80a5-54bbbe4cdcfa/61624222214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d856dfb-9fd5-4652-9315-0955d490916e/22534460688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22cbfe3-c3e9-4995-92f0-cef374e0ee78/12289305017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2845/3288/files/astral_projection_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1256/7452/files/kingroot_latest_version_apk_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7909/7248/files/country_couples_dances.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/55972299503.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_off00006a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A58 5052 bytes
SHA-256: a5549dc6675db52c0dfeab3a0bea60a4bc659ae075734a3eaa2ec23ec7485622
font_01_sfnt_off00007b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9C 10568 bytes
SHA-256: 211714d229d9399c0e7ff2fc181db797f8bafb7462b0a0a4287b318266a7be10

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