Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e0fed419f9218f…

MALICIOUS

PDF

39.7 KB Created: 2020-09-15 02:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2c3cba9fbfde40f952a9cb9a2fe5189f SHA-1: de3e78cd27967698787c0cd8148afad7c651be63 SHA-256: e4e0fed419f9218fb50969b4847839c158ee13cb03a74578ac9baafe81ac7395
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential for malicious content delivery. Although no scripts were explicitly extracted, the nature of the links and the ML classification strongly suggest malicious intent, likely to lure users to malicious sites or to distribute further malware.

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://ttraff.link/pify?keyword=seven+angels+mod+apk+2.1.49r In PDF document text
    • http://kusosibax.somethingblueplannings.com/uploads/1/3/1/4/131407668/zadibudopavejel.pdfIn PDF document text
    • http://nodifu.pilipinohomes.net/uploads/1/3/0/9/130969352/8445816.pdfIn PDF document text
    • http://files.guidetoamericasparks.com/uploads/1/3/2/7/132740756/3ee0d.pdfIn PDF document text
    • http://files.physicianmummyuk.com/uploads/1/3/1/4/131406885/gigalugo.pdfIn PDF document text
    • http://files.thekungfuacademy.org/uploads/1/3/1/4/131484133/2459243.pdfIn PDF document text
    • http://bidoke.celestial.astrosfam.org/uploads/1/3/1/4/131408371/mafezufixobirilenawi.pdfIn PDF document text
    • http://files.wyofinancialproperties.com/uploads/1/3/1/8/131856446/1853361.pdfIn PDF document text
    • http://jewaraso.d-aleksandar.com/uploads/1/3/1/8/131856072/7fe695da2346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/7061/1613/files/1679780474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4690/1672/files/zateliwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/7454974476.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_off00005c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C23 5964 bytes
SHA-256: 347afd16f423c94ac7508e12061364d80a9d9b86c4af54c69c0a4678c877bcd8
font_01_sfnt_off00007076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7076 9976 bytes
SHA-256: e9bf446cd3c65f9900027646e4afd0ce2224c83d12ed76a722897ab0299a386c

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